chore: Update pull request title for snapshot updates (#4429)

To specify this is for `apitester` snapshots

Author: cuixq

.github/workflows/snapshots.yml

@@ -36,7 +36,7 @@ jobs:
       - uses: peter-evans/create-pull-request@84ae59a2cdc2258d6fa0732dd66352dddae2a412 # v7.0.9
         with:
           token: ${{ secrets.PR_TOKEN_BOT }}
-          title: "test: update snapshots"
+          title: "test: update apitester snapshots"
           body: >
             The snapshots have changed, probably due to OSV advisories being changed.