Bump pip-tools from 5.3.1 to 5.5.0

Bumps [pip-tools](https://github.com/jazzband/pip-tools) from 5.3.1 to 5.5.0.
- [Release notes](https://github.com/jazzband/pip-tools/releases)
- [Changelog](https://github.com/jazzband/pip-tools/blob/master/CHANGELOG.md)
- [Commits](jazzband/pip-tools@5.3.1...5.5.0)

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

requirements/dev.txt

@@ -4,23 +4,21 @@
 #
 #    pip-compile --output-file=requirements/dev.txt requirements/dev.in
 #
-atomicwrites==1.4.0       # via pytest
 attrs==20.3.0             # via pytest
 click==7.1.2              # via pip-tools
-colorama==0.4.4           # via pytest
 coverage==5.3             # via pytest-cov
 iniconfig==1.1.1          # via pytest
 jinja2==2.11.2            # via -r requirements/dev.in
 mako==1.1.3               # via -r requirements/dev.in
 markupsafe==1.1.1         # via jinja2, mako
 packaging==20.4           # via pytest
-pip-tools==5.3.1          # via -r requirements/dev.in
+pip-tools==5.5.0          # via -r requirements/dev.in
 pluggy==0.13.1            # via pytest
 py==1.9.0                 # via pytest
 pyparsing==2.4.7          # via packaging
 pytest-cov==2.10.1        # via -r requirements/dev.in
 pytest==6.1.2             # via -r requirements/dev.in, pytest-cov
-six==1.15.0               # via packaging, pip-tools
+six==1.15.0               # via packaging
 tenjin==1.1.1             # via -r requirements/dev.in
 toml==0.10.2              # via pytest
 wheezy.template==3.0.1    # via -r requirements/dev.in