Bump tzlocal from 2.1 to 4.3

Bumps [tzlocal](https://github.com/regebro/tzlocal) from 2.1 to 4.3.
- [Release notes](https://github.com/regebro/tzlocal/releases)
- [Changelog](https://github.com/regebro/tzlocal/blob/master/CHANGES.txt)
- [Commits](regebro/tzlocal@2.1...4.3)

---
updated-dependencies:
- dependency-name: tzlocal
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

setup.py

@@ -23,7 +23,7 @@
           'PyMySQL==1.0.2',
           'mysql-replication==0.30',
           'plpygis==0.2.0',
-          'tzlocal==2.1',
+          'tzlocal==4.3',
       ],
       extras_require={
           'test': [