build(deps): bump pytz from 2020.5 to 2021.1

Bumps [pytz](https://github.com/stub42/pytz) from 2020.5 to 2021.1.
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](stub42/pytz@release_2020.5...release_2021.1)

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

test-requirements.txt

@@ -277,9 +277,9 @@ pytest==6.2.2 \
     #   pytest-asyncio
     #   pytest-cov
     #   pytest-mock
-pytz==2020.5 \
-    --hash=sha256:16962c5fb8db4a8f63a26646d8886e9d769b6c511543557bc84e9569fb9a9cb4 \
-    --hash=sha256:180befebb1927b16f6b57101720075a984c019ac16b1b7575673bea42c6c3da5
+pytz==2021.1 \
+    --hash=sha256:83a4a90894bf38e243cf052c8b58f381bfe9a7a483f6a9cab140bc7f702ac4da \
+    --hash=sha256:eb10ce3e7736052ed3623d49975ce333bcd712c7bb19a58b9e2089d4057d0798
     # via babel
 regex==2020.11.13 \
     --hash=sha256:02951b7dacb123d8ea6da44fe45ddd084aa6777d4b2454fa0da61d569c6fa538 \