fix(ci): use pyproject.toml as uv cache key instead of uv.lock

uv.lock is gitignored (library best practice). The setup-uv action
defaults to caching based on uv.lock which fails when the file is
not in the repo.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: varun369

.github/workflows/benchmarks.yml

@@ -14,6 +14,7 @@ jobs:
       - uses: astral-sh/setup-uv@v4
         with:
           enable-cache: true
+          cache-dependency-glob: "**/pyproject.toml"
 
       - name: Set up Python
         uses: actions/setup-python@v5

.github/workflows/ci.yml

@@ -25,6 +25,7 @@ jobs:
       - uses: astral-sh/setup-uv@v4
         with:
           enable-cache: true
+          cache-dependency-glob: "**/pyproject.toml"
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5

.github/workflows/publish-pypi.yml

@@ -22,6 +22,7 @@ jobs:
       - uses: astral-sh/setup-uv@v4
         with:
           enable-cache: true
+          cache-dependency-glob: "**/pyproject.toml"
 
       - name: Set up Python
         uses: actions/setup-python@v5