build(deps): bump msgspec from 0.19.0 to 0.20.0

Bumps [msgspec](https://github.com/jcrist/msgspec) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/jcrist/msgspec/releases)
- [Changelog](https://github.com/jcrist/msgspec/blob/main/docs/changelog.md)
- [Commits](https://github.com/jcrist/msgspec/compare/0.19.0...0.20.0)

---
updated-dependencies:
- dependency-name: msgspec
  dependency-version: 0.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -44,5 +44,5 @@ six==1.17.0
 sortedcontainers==2.4.0
 viv-utils==0.8.0
 vivisect==1.2.1
-msgspec==0.19.0
+msgspec==0.20.0
 bump-my-version==1.2.4