ci: bump actions/checkout to v7 and actions/cache to v6

Update GitHub Actions pins across the workflows: actions/checkout v6 to v7
(publish, test, codeql) and actions/cache v5 to v6 (test). Supersedes #121,
#123.

Author: kishore7snehil

.github/workflows/codeql.yml

@@ -36,7 +36,7 @@ jobs:
         run: exit 0 # Skip unnecessary test runs for dependabot and merge queues. Artifically flag as successful, as this is a required check for branch protection.
 
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v4

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
     if: github.event_name == 'workflow_dispatch' || (github.event_name == 'pull_request' && github.event.pull_request.merged && startsWith(github.event.pull_request.head.ref, 'release/'))
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0
           fetch-tags: true
@@ -61,7 +61,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
           fetch-tags: true

.github/workflows/test.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
@@ -43,7 +43,7 @@ jobs:
 
     - name: Load cached venv
       id: cached-poetry-dependencies
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       with:
         path: ./.venv
         key: venv-${{ runner.os }}-${{ matrix.python-version }}-${{ hashFiles('**/poetry.lock') }}