Adding upstream version 5.2.3+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

.github/workflows/issue-labeled.yml

@@ -0,0 +1,19 @@
+name: Issue Labeled
+
+on:
+  issues:
+    types: [labeled]
+
+jobs:
+  issue-labeled:
+    if: github.repository == 'twbs/bootstrap'
+    runs-on: ubuntu-latest
+    steps:
+      - name: awaiting reply
+        if: github.event.label.name == 'needs-example'
+        uses: actions-cool/issues-helper@v3
+        with:
+          actions: "create-comment"
+          token: ${{ secrets.GITHUB_TOKEN }}
+          body: |
+            Hello @${{ github.event.issue.user.login }}. Bug reports must include a **live demo** of the issue. Per our [contributing guidelines](https://github.com/twbs/bootstrap/blob/main/.github/CONTRIBUTING.md), please create a reduced test case on [CodePen](https://codepen.io/) or [StackBlitz](https://stackblitz.com/) and report back with your link, Bootstrap version, and specific browser and Operating System details.