[stubsabot] Bump croniter to 6.0.0

Release: https://pypi.org/pypi/croniter/6.0.0
Homepage: http://github.com/kiorky/croniter
Repository: https://github.com/kiorky/croniter
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/croniter

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- Leave this PR open (as a reminder, and to prevent stubsabot from opening another PR)
- Fix stubtest failures in another PR, then close this PR

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Author: stubsabot

Diff for: stubs/croniter/METADATA.toml

@@ -1,2 +1,2 @@
-version = "5.0.1"
+version = "6.0.0"
 upstream_repository = "https://github.com/kiorky/croniter"