ci(workflows): avoid github.actor in conditions (#28174)

Author: caugner

.github/workflows/labeler.yml

@@ -17,7 +17,7 @@ jobs:
           sync-labels: true
 
   label-by-size:
-    if: github.actor != 'dependabot[bot]' && !startsWith(github.event.pull_request.title, 'Release v')
+    if: github.secret_source == 'Actions' && !startsWith(github.event.pull_request.title, 'Release v')
     needs: label-py-path
     runs-on: ubuntu-latest
     steps:

.github/workflows/release-pr.yml

@@ -19,7 +19,7 @@ concurrency:
 
 jobs:
   manage-release-pr:
-    if: github.repository == 'mdn/browser-compat-data' && github.actor != 'dependabot[bot]' && !startsWith(github.event.head_commit.message, 'Release v')
+    if: github.repository == 'mdn/browser-compat-data' && github.secret_source == 'Actions' && !startsWith(github.event.head_commit.message, 'Release v')
     name: Manage release PR
     runs-on: ubuntu-latest