Pin dependencies (#29946)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/build_debian.yaml

@@ -14,7 +14,7 @@ jobs:
             R2_URL: ${{ vars.CF_R2_S3_API }}
             VERSION: ${{ github.ref_name }}
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
 
             - name: Download package
               run: |
@@ -62,7 +62,7 @@ jobs:
                   dpkg-gencontrol -v"$VERSION" -ldebian/tmp/DEBIAN/changelog
                   dpkg-deb -Zxz --root-owner-group --build debian/tmp element-web.deb
 
-            - uses: actions/upload-artifact@v4
+            - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
               with:
                   name: element-web.deb
                   path: element-web.deb