Merge branch '6.4' into 7.0

* 6.4:
  Remove subtree split checks
  Revert "minor #54653 Auto-close PRs on subtree-splits (nicolas-grekas)"

.gitattributes

@@ -1,3 +1,4 @@
 /Tests export-ignore
 /phpunit.xml.dist export-ignore
-/.git* export-ignore
+/.gitattributes export-ignore
+/.gitignore export-ignore

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,8 +0,0 @@
-Please do not submit any Pull Requests here. They will be closed.
----
-
-Please submit your PR here instead:
-https://github.com/symfony/symfony
-
-This repository is what we call a "subtree split": a read-only subset of that main repository.
-We're looking forward to your PR there!

.github/workflows/check-subtree-split.yml

@@ -1,37 +0,0 @@
-name: Check subtree split
-
-on:
-  pull_request_target:
-
-jobs:
-  close-pull-request:
-    runs-on: ubuntu-latest
-
-    steps:
-    - name: Close pull request
-      uses: actions/github-script@v6
-      with:
-        script: |
-          if (context.repo.owner === "symfony") {
-            github.rest.issues.createComment({
-              owner: "symfony",
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `
-          Thanks for your Pull Request! We love contributions.
-
-          However, you should instead open your PR on the main repository:
-          https://github.com/symfony/symfony
-
-          This repository is what we call a "subtree split": a read-only subset of that main repository.
-          We're looking forward to your PR there!
-          `
-            });
-
-            github.rest.pulls.update({
-              owner: "symfony",
-              repo: context.repo.repo,
-              pull_number: context.issue.number,
-              state: "closed"
-            });
-          }