fixup! workflows: install svn when brew fetch needs it

.github/workflows/scheduled.yml

@@ -124,6 +124,12 @@ jobs:
           brew install curl
           echo "HOMEBREW_FORCE_BREWED_CURL=1" >>"${GITHUB_ENV}"
 
+      - name: Install and use Homebrew svn if needed
+        run: |
+          if brew ruby -e 'puts Formula[ARGV.first].deps.any? { |d| d.name == "subversion" && d.implicit? }' $FORMULA; then
+            brew install svn
+          fi
+
       - name: Check formula source is not archived.
         id: archived
         run: brew audit --online --skip-style --only github_repository_archived,gitlab_repository_archived "$FORMULA"
@@ -149,19 +155,7 @@ jobs:
       - name: Check formula for missing sources.
         id: fetch
         if: always() && steps.archived.conclusion != 'failure'
-        run: |
-          FETCH_OUTPUT=$(brew fetch --build-from-source "$FORMULA" 2>&1 || true)
-          FETCH_EXIT_CODE=$?
-          echo "$FETCH_OUTPUT"
-
-          if echo "$FETCH_OUTPUT" | grep -q "You must: brew install svn"; then
-            echo "SVN required. Installing..."
-            brew install svn
-            echo "Retrying fetch..."
-            brew fetch --build-from-source "$FORMULA"
-          elif [ $FETCH_EXIT_CODE -ne 0 ]; then
-            exit $FETCH_EXIT_CODE
-          fi
+        run: brew fetch --build-from-source "$FORMULA"
 
       - name: Report fetch issues
         if: failure() && steps.fetch.conclusion == 'failure'