Bump SINTEF/ci-cd from 2.8.0 to 2.8.1 in the actions group (#513)

Bumps the actions group with 1 update: [SINTEF/ci-cd](https://github.com/sintef/ci-cd).


Updates `SINTEF/ci-cd` from 2.8.0 to 2.8.1
- [Release notes](https://github.com/sintef/ci-cd/releases)
- [Changelog](https://github.com/SINTEF/ci-cd/blob/main/CHANGELOG.md)
- [Commits](SINTEF/ci-cd@v2.8.0...v2.8.1)

---
updated-dependencies:
- dependency-name: SINTEF/ci-cd
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

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

.github/workflows/cd_release.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   update-repo-and-release:
     name: External
-    uses: SINTEF/ci-cd/.github/workflows/cd_release.yml@v2.8.0
+    uses: SINTEF/ci-cd/.github/workflows/cd_release.yml@v2.8.1
     if: github.repository == 'Materials-Consortia/optimade-gateway' && startsWith(github.ref, 'refs/tags/v')
     with:
       # General

.github/workflows/ci_automerge_dependabot.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   update-dependabot-branch:
     name: External
-    uses: SINTEF/ci-cd/.github/workflows/ci_automerge_prs.yml@v2.8.0
+    uses: SINTEF/ci-cd/.github/workflows/ci_automerge_prs.yml@v2.8.1
     if: github.repository_owner == 'Materials-Consortia' && ( ( startsWith(github.event.pull_request.head.ref, 'dependabot/') && github.actor == 'dependabot[bot]' ) || ( github.event.pull_request.head.ref == 'pre-commit-ci-update-config' && github.actor == 'pre-commit-ci[bot]' ) )
     secrets:
       PAT: ${{ secrets.RELEASE_PAT_CASPER }}

.github/workflows/ci_cd_updated_main.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   update-dependabot-branch-and-docs:
     name: External
-    uses: SINTEF/ci-cd/.github/workflows/ci_cd_updated_default_branch.yml@v2.8.0
+    uses: SINTEF/ci-cd/.github/workflows/ci_cd_updated_default_branch.yml@v2.8.1
     if: github.repository_owner == 'Materials-Consortia'
     with:
       # General

.github/workflows/ci_tests.yml

@@ -10,7 +10,7 @@ on:
 jobs:
   basic_tests:
     name: External
-    uses: SINTEF/ci-cd/.github/workflows/ci_tests.yml@v2.8.0
+    uses: SINTEF/ci-cd/.github/workflows/ci_tests.yml@v2.8.1
     with:
       # General
       install_extras: "[dev]"