Run stubtest on all third party stubs if requirements.txt is changed (#9132)

.github/workflows/daily.yml

@@ -4,6 +4,10 @@ on:
   workflow_dispatch:
   schedule:
     - cron: "0 0 * * *"
+  pull_request:
+    paths:
+      - 'requirements-tests.txt'
+      - '.github/workflows/daily.yml'
 
 # Please keep the permissions minimal, as stubtest runs arbitrary code from pypi.
 permissions:

.github/workflows/stubtest_stdlib.yml

@@ -10,7 +10,7 @@ on:
       - 'stdlib/**'
       - '.github/workflows/stubtest_stdlib.yml'
       - 'tests/**'
-      - 'requirements-tests.txt'
+      # When requirements.txt changes, we run `daily.yml`, which includes stdlib stubtest
 
 permissions:
   contents: read