build(deps): bump packaging from 20.4 to 20.8

Bumps [packaging](https://github.com/pypa/packaging) from 20.4 to 20.8.
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/master/CHANGELOG.rst)
- [Commits](pypa/packaging@20.4...20.8)

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

test-requirements.txt

@@ -193,9 +193,9 @@ mypy-extensions==0.4.3 \
     --hash=sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d \
     --hash=sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8 \
     # via black
-packaging==20.4 \
-    --hash=sha256:4357f74f47b9c12db93624a82154e9b120fa8293699949152b22065d556079f8 \
-    --hash=sha256:998416ba6962ae7fbd6596850b80e17859a5753ba17c32284f67bfff33784181 \
+packaging==20.8 \
+    --hash=sha256:24e0da08660a87484d1602c30bb4902d74816b6985b93de36926f5bc95741858 \
+    --hash=sha256:78598185a7008a470d64526a8059de9aaa449238f280fc9eb6b13ba6c4109093 \
     # via -r test-requirements.in, pytest, sphinx
 pathspec==0.8.1 \
     --hash=sha256:86379d6b86d75816baba717e64b1a3a3469deb93bb76d613c9ce79edc5cb68fd \
@@ -299,7 +299,7 @@ requests==2.25.0 \
 six==1.15.0 \
     --hash=sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259 \
     --hash=sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced \
-    # via -r test-requirements.in, astroid, packaging
+    # via -r test-requirements.in, astroid
 snowballstemmer==2.0.0 \
     --hash=sha256:209f257d7533fdb3cb73bdbd24f436239ca3b2fa67d56f6ff88e86be08cc5ef0 \
     --hash=sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52 \