PYTHON-5862 Address PR feedback: fix bash quoting, improve docs, set UV_EXCLUDE_NEWER in GHA

- Fix nested double-quote bash syntax in combine-coverage.sh (python3 -c argument
  must use single quotes inside the ${...:-$(...)} expansion)
- Add actionable steps to CONTRIBUTING.md Dependabot section
- Compute and export UV_EXCLUDE_NEWER in all uv-using GitHub Actions jobs for
  deterministic package resolution without a lock file

Author: aclark4life

.evergreen/combine-coverage.sh

@@ -8,7 +8,7 @@ set -eu
 # Set up the virtual env.
 . .evergreen/scripts/setup-dev-env.sh
 export UV_NO_LOCK=1
-export UV_EXCLUDE_NEWER="${UV_EXCLUDE_NEWER:-$(python3 -c "from datetime import datetime, timedelta, timezone; print((datetime.now(timezone.utc) - timedelta(days=7)).strftime('%Y-%m-%dT%H:%M:%SZ'))")}"
+export UV_EXCLUDE_NEWER="${UV_EXCLUDE_NEWER:-$(python3 -c 'from datetime import datetime, timedelta, timezone; print((datetime.now(timezone.utc) - timedelta(days=7)).strftime("%Y-%m-%dT%H:%M:%SZ"))')}"
 uv sync --group coverage
 source .venv/bin/activate
 

.github/workflows/test-python.yml

@@ -33,6 +33,8 @@ jobs:
         with:
           enable-cache: true
           python-version: "3.10"
+      - name: Set UV_EXCLUDE_NEWER
+        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
       - name: Install just
         run: uv tool install rust-just
       - name: Install Python dependencies
@@ -75,6 +77,8 @@ jobs:
         with:
           enable-cache: true
           python-version: ${{ matrix.python-version }}
+      - name: Set UV_EXCLUDE_NEWER
+        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
       - id: setup-mongodb
         uses: mongodb-labs/drivers-evergreen-tools@master
         with:
@@ -97,6 +101,8 @@ jobs:
         with:
           enable-cache: true
           python-version: "3.10"
+      - name: Set UV_EXCLUDE_NEWER
+        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
       - id: setup-mongodb
         uses: mongodb-labs/drivers-evergreen-tools@master
         with:
@@ -125,6 +131,8 @@ jobs:
         with:
           enable-cache: true
           python-version: "3.10"
+      - name: Set UV_EXCLUDE_NEWER
+        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
       - name: Install just
         run: uv tool install rust-just
       - id: setup-mongodb
@@ -150,6 +158,8 @@ jobs:
         with:
           enable-cache: true
           python-version: "3.10"
+      - name: Set UV_EXCLUDE_NEWER
+        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
       - name: Install just
         run: uv tool install rust-just
       - name: Install dependencies
@@ -169,6 +179,8 @@ jobs:
         with:
           enable-cache: true
           python-version: "3.10"
+      - name: Set UV_EXCLUDE_NEWER
+        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
       - name: Install just
         run: uv tool install rust-just
       - name: Install dependencies
@@ -193,6 +205,8 @@ jobs:
         with:
           enable-cache: true
           python-version: "${{matrix.python}}"
+      - name: Set UV_EXCLUDE_NEWER
+        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
       - name: Install just
         run: uv tool install rust-just
       - name: Install dependencies
@@ -214,6 +228,8 @@ jobs:
         with:
           enable-cache: true
           python-version: "3.10"
+      - name: Set UV_EXCLUDE_NEWER
+        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
       - name: Install just
         run: uv tool install rust-just
       - name: Install dependencies
@@ -303,6 +319,8 @@ jobs:
           uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # v8.2.0
           with:
             python-version: "3.9"
+        - name: Set UV_EXCLUDE_NEWER
+          run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
         - id: setup-mongodb
           uses: mongodb-labs/drivers-evergreen-tools@master
           with:

CONTRIBUTING.md

@@ -574,5 +574,9 @@ From the spawn host or Ubuntu image, do the following:
 ## Dependabot updates
 
 Dependabot will raise PRs at most once per week, grouped by GitHub Actions updates and Python requirement
-file updates.  To handle a failing Dependabot PR, you can use a method like `gh pr checkout <pr number>`,
-then push the changes.  If a typing dependency has changed, also run `just typing` and handle any new findings.
+file updates.  To handle a failing Dependabot PR:
+
+1. Check out the PR: `gh pr checkout <pr number>`
+2. Re-run the linters to pick up any formatting changes: `just lint-manual`
+3. If a typing dependency changed, run `just typing` and fix any new errors.
+4. Commit the changes and push: `git add -u && git commit -m "Address linter/typing issues" && git push`