Bump the actions group in /.github/workflows with 2 updates

Bumps the actions group in /.github/workflows with 2 updates: [OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml](https://github.com/openastronomy/github-actions-workflows) and [OpenAstronomy/github-actions-workflows/.github/workflows/publish_pure_python.yml](https://github.com/openastronomy/github-actions-workflows).


Updates `OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml` from 2.6.3 to 2.6.4
- [Release notes](https://github.com/openastronomy/github-actions-workflows/releases)
- [Commits](OpenAstronomy/github-actions-workflows@2835f0c...4193751)

Updates `OpenAstronomy/github-actions-workflows/.github/workflows/publish_pure_python.yml` from 2.6.3 to 2.6.4
- [Release notes](https://github.com/openastronomy/github-actions-workflows/releases)
- [Commits](OpenAstronomy/github-actions-workflows@2835f0c...4193751)

---
updated-dependencies:
- dependency-name: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml
  dependency-version: 2.6.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
- dependency-name: OpenAstronomy/github-actions-workflows/.github/workflows/publish_pure_python.yml
  dependency-version: 2.6.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci_workflows.yml

@@ -14,7 +14,7 @@ concurrency:
 
 jobs:
   tests:
-    uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@2835f0cacddf3f8de198db9afdb5354a5cebe0ef # v2.6.3
+    uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@4193751d511425d4edc1d5657c24b2128d49b017 # v2.6.4
     with:
       envs: |
         - linux: codestyle
@@ -33,7 +33,7 @@ jobs:
         - linux: py313-test-devdeps
   publish:
     needs: tests
-    uses: OpenAstronomy/github-actions-workflows/.github/workflows/publish_pure_python.yml@2835f0cacddf3f8de198db9afdb5354a5cebe0ef # v2.6.3
+    uses: OpenAstronomy/github-actions-workflows/.github/workflows/publish_pure_python.yml@4193751d511425d4edc1d5657c24b2128d49b017 # v2.6.4
     with:
       test_extras: test
       test_command: pytest $GITHUB_WORKSPACE/tests; pytest --arraydiff $GITHUB_WORKSPACE/tests