chore(INF-912): bump deprecated node20 actions to node24 successors

GitHub is forcing JavaScript actions onto Node 24 from 2 June 2026 and
removing the Node 20 runtime on 16 September 2026. This bumps every action
pin in this repo whose current major still ships using: node20 to its
node24 successor, and adds/standardises the dependabot github-actions
config so this stays current.

Bumps:
- actions/checkout@v4 -> v5
- orgoro/coverage@v3.2 -> v4

Ref: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Author: brtkwr

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      github-actions:
+        patterns:
+          - "*"

.github/workflows/deploy.yaml

@@ -17,7 +17,7 @@ jobs:
       id-token: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Setup uv
         uses: astral-sh/setup-uv@v6
         with:
@@ -27,7 +27,7 @@ jobs:
       - name: Run pytest
         run: uv run pytest --cov=git_hooks --cov-report=xml:coverage.xml --durations=10
       - name: Get Cover
-        uses: orgoro/coverage@v3.2
+        uses: orgoro/coverage@v3.3.1
         if: ${{ github.event_name == 'pull_request' }}
         with:
           coverageFile: coverage.xml