build(deps): bump multiformats from 0.2.1 to 0.3.1.post4

Bumps [multiformats](https://github.com/hashberg-io/multiformats) from 0.2.1 to 0.3.1.post4.
- [Release notes](https://github.com/hashberg-io/multiformats/releases)
- [Commits](https://github.com/hashberg-io/multiformats/commits)

---
updated-dependencies:
- dependency-name: multiformats
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -64,7 +64,7 @@ lxml==4.9.4
 MarkupSafe==2.1.3
 mf2py==2.0.1
 mf2util==0.5.2
-multiformats==0.2.1
+multiformats==0.3.1.post4
 multiformats-config==0.2.0.post4
 oauthlib==3.2.2
 packaging==23.2