chore(deps): pin dependencies

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

.github/workflows/build_container.yaml

@@ -40,7 +40,7 @@ jobs:
 
       - name: Extract branch name
         id: extract_branch
-        uses: keptn/gh-action-extract-branch-name@main
+        uses: keptn/gh-action-extract-branch-name@6ca4fe061da10c66b2d7341fd1fb12962ad911b2 # main
 
       - name: Get current date and time
         id: get_datetime

.github/workflows/release.yaml

@@ -41,7 +41,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Free Disk Space (Ubuntu)
-        uses: jlumbroso/free-disk-space@main
+        uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be # main
         with:
           # this might remove tools that are actually needed,
           # if set to "true" but frees about 6 GB