Bump setup-swift and re-configure dependabot (#1560)

* Update `setup-swift` to v1.22.0

* Configure dependabot to scan `setup-swift` dir

* Add reminder to manually update the SHA in CLI test

* Add comment on new Dependabot directory

.github/dependabot.yml

@@ -15,3 +15,7 @@ updates:
     directory: "/"
     schedule:
       interval: weekly
+  - package-ecosystem: github-actions
+    directory: "/.github/setup-swift/" # All subdirectories outside of "/.github/workflows" must be explicitly included.
+    schedule:
+      interval: weekly

.github/setup-swift/action.yml

@@ -26,7 +26,7 @@ runs:
           VERSION="5.7.0"
         fi
         echo "version=$VERSION" | tee -a $GITHUB_OUTPUT
-    - uses: swift-actions/setup-swift@194625b58a582570f61cc707c3b558086c26b723
+    - uses: swift-actions/setup-swift@da0e3e04b5e3e15dbc3861bd835ad9f0afe56296 # Please update the corresponding SHA in the CLI's CodeQL Action Integration Test.
       if: "(runner.os != 'Windows') && (matrix.version == 'cached' || matrix.version == 'latest' || matrix.version == 'nightly-latest')"
       with:
         swift-version: "${{steps.get_swift_version.outputs.version}}"