build(deps): bump isort from 5.6.3 to 5.6.4

Bumps [isort](https://github.com/pycqa/isort) from 5.6.3 to 5.6.4.
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/develop/CHANGELOG.md)
- [Commits](PyCQA/isort@5.6.3...5.6.4)

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

test-requirements.txt

@@ -108,9 +108,9 @@ iniconfig==1.1.1 \
     --hash=sha256:011e24c64b7f47f6ebd835bb12a743f2fbe9a26d4cecaa7f53bc4f35ee9da8b3 \
     --hash=sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32 \
     # via pytest
-isort==5.6.3 \
-    --hash=sha256:2c1d044a96c74367ab12188593d134c596747d97aec43b9cdb12eea83b6889d2 \
-    --hash=sha256:3820dd92c3214290cda6351f2ae2cedd5170759bc434af600eaad4f7a82a6ade \
+isort==5.6.4 \
+    --hash=sha256:dcab1d98b469a12a1a624ead220584391648790275560e1a43e54c5dceae65e7 \
+    --hash=sha256:dcaeec1b5f0eca77faea2a35ab790b4f3680ff75590bfcb7145986905aab2f58 \
     # via pylint
 jinja2==2.11.2 \
     --hash=sha256:89aab215427ef59c34ad58735269eb58b1a5808103067f7bb9d5836c651b3bb0 \