Revert "testing/py3-tzlocal: update to 4.2"

This reverts commit 71a655dc.

fixes: #13687

 - py3-tzlocal 4.2 introduces a runtime dependency on the yet to be
   packaged 'pytz_deprecation_shim' python module.

testing/py3-tzlocal/APKBUILD

 # Maintainer: prspkt <prspkt@protonmail.com>
 pkgname=py3-tzlocal
-pkgver=4.2
-pkgrel=0
+pkgver=2.1
+pkgrel=2
 pkgdesc="Python tzinfo object for the local timezone"
 url="https://github.com/regebro/tzlocal"
 arch="noarch"
@@ -22,6 +22,4 @@ package() {
 	python3 setup.py install --prefix=/usr --root="$pkgdir"
 }
 
-sha512sums="
-5d1000bd8756ca2678655dbeedcfd6ef8d709503293303c98a48af234aca0d1525913585d679759c6fd7d4c5ef046c98384ee6e7a9eba769f81d05173ff0d77f  tzlocal-4.2.tar.gz
-"
+sha512sums="5419f3316dfcbf0355cc6f0790454fe6cecfa8b1ae17bfa7bf8aff89b0af3e63c94ffe9c22b11f612e53826a33e7179ff71bc2a86f6a358cdff36c7ae34e2453  tzlocal-2.1.tar.gz"