Update twine requirement from <5 to <6

Updates the requirements on [twine](https://github.com/pypa/twine) to permit the latest version.
- [Release notes](https://github.com/pypa/twine/releases)
- [Changelog](https://github.com/pypa/twine/blob/main/docs/changelog.rst)
- [Commits](pypa/twine@1.3.0...5.0.0)

---
updated-dependencies:
- dependency-name: twine
  dependency-type: direct:production
...

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

requirements-release.txt

@@ -1,4 +1,4 @@
 build<2
 bump2version<2
 keyring<25
-twine<5
+twine<6