chore: bump actions/add-to-project from 0.6.1 to 1.0.0 (#342)

Bumps [actions/add-to-project](https://github.com/actions/add-to-project) from 0.6.1 to 1.0.0.
- [Release notes](https://github.com/actions/add-to-project/releases)
- [Commits](actions/add-to-project@v0.6.1...v1.0.0)

---
updated-dependencies:
- dependency-name: actions/add-to-project
  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>

.github/workflows/add-issue-to-project.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: register bug/enhancement issues with release planning project
-        uses: actions/add-to-project@v0.6.1
+        uses: actions/add-to-project@v1.0.0
         with:
           project-url: https://github.com/orgs/varfish-org/projects/2
           labeled: bug, needs-triage, enhancement

.github/workflows/add-pr-to-project.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: register pull requests with release planning project
-        uses: actions/add-to-project@v0.6.1
+        uses: actions/add-to-project@v1.0.0
         with:
           project-url: https://github.com/orgs/varfish-org/projects/2
           labeled: needs-review