Bump pytest from 5.4.2 to 6.2.1

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.4.2 to 6.2.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.4.2...6.2.1)

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

requirements.txt

@@ -4,33 +4,33 @@
 #
 #    pip-compile --output-file requirements.txt requirements.in
 #
-attrs==18.1.0             # via pytest
+attrs==20.3.0             # via pytest
 click==7.1.2              # via -r requirements.in, pip-tools
 coverage==5.0.4           # via pytest-cov
 croniter==0.3.34          # via -r requirements.in
 flake8-isort==4.0.0       # via -r requirements.in
 flake8==3.8.4             # via -r requirements.in, flake8-isort
 importlib-metadata==1.5.0  # via flake8, pluggy, pytest
+iniconfig==1.1.1          # via pytest
 isort==4.3.21             # via flake8-isort
 mccabe==0.6.1             # via flake8
-more-itertools==4.1.0     # via pytest
 natsort==7.0.1            # via croniter
 packaging==20.3           # via pytest
 pip-tools==5.3.1          # via -r requirements.in
 pluggy==0.13.1            # via pytest
-py==1.5.3                 # via pytest
+py==1.10.0                # via pytest
 pycodestyle==2.6.0        # via flake8
 pyflakes==2.2.0           # via flake8
 pyparsing==2.4.6          # via packaging
 pytest-cov==2.9.0         # via -r requirements.in
 pytest-mock==3.3.1        # via -r requirements.in
-pytest==5.4.2             # via -r requirements.in, pytest-cov, pytest-mock
+pytest==6.2.1             # via -r requirements.in, pytest-cov, pytest-mock
 python-dateutil==2.7.3    # via croniter
 pytz==2020.1              # via -r requirements.in
 redis==3.5.3              # via -r requirements.in
-six==1.11.0               # via more-itertools, packaging, pip-tools, python-dateutil
+six==1.11.0               # via packaging, pip-tools, python-dateutil
 testfixtures==6.14.0      # via flake8-isort
-wcwidth==0.1.9            # via pytest
+toml==0.10.2              # via pytest
 zipp==3.1.0               # via importlib-metadata
 
 # The following packages are considered to be unsafe in a requirements file: