Bump tgagor/action-crosspost from 1.6.3 to 1.6.4 (#355)

Bumps [tgagor/action-crosspost](https://github.com/tgagor/action-crosspost) from 1.6.3 to 1.6.4.
- [Release notes](https://github.com/tgagor/action-crosspost/releases)
- [Commits](tgagor/action-crosspost@9523ff4...73c5543)

---
updated-dependencies:
- dependency-name: tgagor/action-crosspost
  dependency-version: 1.6.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/crosspost.yml

@@ -34,7 +34,7 @@ jobs:
       contents: read
     steps:
       - name: Crosspost to Bluesky and Mastodon
-        uses: tgagor/action-crosspost@9523ff489bc74e1a9849c5d3071b6bcbad40042d # v1.6.3
+        uses: tgagor/action-crosspost@73c5543b6b0013eb5e3ccbe5401fd17e0ad79171 # v1.6.4
         env:
           RELEASE_TAG: ${{ env.RELEASE_TAG }}
         with: