Bump croniter from 1.0.2 to 1.0.6

Bumps [croniter](https://github.com/kiorky/croniter) from 1.0.2 to 1.0.6.
- [Release notes](https://github.com/kiorky/croniter/releases)
- [Changelog](https://github.com/kiorky/croniter/blob/master/docs/CHANGES.rst)
- [Commits](corpusops/croniter@1.0.2...1.0.6)

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

requirements.txt

@@ -2,7 +2,7 @@ backports.ssl-match-hostname==3.7.0.1
 certifi==2020.12.5
 chardet==4.0.0
 configobj==5.0.6
-croniter==1.0.2
+croniter==1.0.6
 dnspython==2.1.0
 docker==4.4.2
 docker-pycreds==0.4.0