GHA/dependabot: find more pip deps, tweak commit prefix

Before this patch the Dependabot updater was only picking up
`tests/requirements.txt`:
https://github.com/curl/curl/network/updates/26616523/jobs

Also prefix commit messages with `GHA:`.

Bug: https://github.com/curl/curl/pull/18761#issuecomment-3381147189
Follow-up to b04137c1c6ed164594279c7d04b5e051634453ea #18761

Closes #18939

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index a21592ee3e48de2f3a028ae571816e0b00470384..858b99e8e8511db8a33462d7488e359423a4705a 100644 (file)
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -8,8 +8,15 @@ updates:
     directory: '/'
     schedule:
       interval: 'monthly'
+    commit-message:
+      prefix: 'GHA:'
 
   - package-ecosystem: 'pip'
-    directory: '/'
+    directories:
+      - '/.github/scripts'
+      - '/tests'
+      - '/tests/http'
     schedule:
       interval: 'monthly'
+    commit-message:
+      prefix: 'GHA:'