Bump pytz from 2022.5 to 2022.6

Bumps [pytz](https://github.com/stub42/pytz) from 2022.5 to 2022.6.
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](stub42/pytz@release_2022.5...release_2022.6)

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

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

Author: dependabot[bot]

requirements/production.txt

@@ -15,6 +15,6 @@ pinax-eventlog==5.1.1
 pip==22.3.1
 -e git+https://github.com/pretalx/pretalx@9b0934c0cef6ec022608ff19ab15176528dac345#egg=pretalx[redis]&subdirectory=src
 psycopg2==2.9.4
-pytz==2022.5
+pytz==2022.6
 sentry-sdk==1.11.1
 virtualenv==20.17.0