devops: delete deprecated 10.14 build trigger (#12825)

.github/workflows/trigger_build_deprecated_webkit_mac_10.14.yml

@@ -1,24 +0,0 @@
-name: "Deprecated WebKit Mac 10.14 Builder"
-
-on:
-  push:
-    branches:
-      - main
-      - release-*
-    paths:
-      - browser_patches/depcrecated-webkit-mac-10.14/BUILD_NUMBER
-      - .github/workflows/trigger_build_deprecated_webkit_mac_10.14.yml
-
-jobs:
-  trigger:
-    name: "trigger"
-    runs-on: ubuntu-20.04
-    steps:
-    - run: |
-        curl -X POST \
-          -H "Accept: application/vnd.github.v3+json" \
-          -H "Authorization: token ${GH_TOKEN}" \
-          --data '{"event_type": "build_deprecated_webkit_mac_10.14"}' \
-          https://api.github.com/repos/microsoft/playwright-internal/dispatches
-      env:
-        GH_TOKEN: ${{ secrets.REPOSITORY_DISPATCH_PERSONAL_ACCESS_TOKEN }}