chore: update GitHub Actions to use commit hashes (#4659)

.github/workflows/ci-freebsd.yml

@@ -71,7 +71,7 @@ jobs:
       matrix: ${{ fromJson(needs.setup-matrix.outputs.matrix) }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8  # v6.0.1
         with:
           submodules: recursive
 
@@ -258,7 +258,7 @@ jobs:
         if: >-
           always() &&
           (steps.test_report.outcome == 'success')
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f  # v6.0.0
         with:
           name: coverage-FreeBSD-${{ matrix.bsd_release }}-${{ matrix.cmake_processor }}
           path: |
@@ -267,7 +267,7 @@ jobs:
           if-no-files-found: error
 
       - name: Upload Artifacts
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f  # v6.0.0
         with:
           name: build-FreeBSD-${{ matrix.bsd_release }}-${{ matrix.cmake_processor }}
           path: artifacts/