Bump doctrine/.github from 7.3.0 to 8.0.0 (#2847)

Bumps [doctrine/.github](https://github.com/doctrine/.github) from 7.3.0 to 8.0.0.
- [Release notes](https://github.com/doctrine/.github/releases)
- [Commits](doctrine/.github@7.3.0...8.0.0)

---
updated-dependencies:
- dependency-name: doctrine/.github
  dependency-version: 8.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/release-on-milestone-closed.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   release:
     name: "Git tag, release & create merge-up PR"
-    uses: "doctrine/.github/.github/workflows/release-on-milestone-closed.yml@7.3.0"
+    uses: "doctrine/.github/.github/workflows/release-on-milestone-closed.yml@8.0.0"
     with:
       use-next-minor-as-default-branch: true
     secrets:

.github/workflows/website-schema.yml

@@ -18,4 +18,4 @@ on:
 jobs:
   json-validate:
     name: "Validate JSON schema"
-    uses: "doctrine/.github/.github/workflows/website-schema.yml@7.3.0"
+    uses: "doctrine/.github/.github/workflows/website-schema.yml@8.0.0"