Bump pip-tools from 5.4.0 to 5.5.0

Bumps [pip-tools](https://github.com/jazzband/pip-tools) from 5.4.0 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](https://github.com/jazzband/pip-tools/compare/5.4.0...5.5.0)

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

requirements-dev.in

@@ -1,3 +1,3 @@
 pdoc3==0.9.1
-pip-tools==5.4.0
+pip-tools==5.5.0
 helium==3.0.5

requirements-dev.txt

@@ -56,18 +56,14 @@ markupsafe==1.1.1 \
 pdoc3==0.9.1 \
     --hash=sha256:e1848d5485b8dd4662272f83bb5f7df4a68e0a5d76c87be30327977777168894 \
     # via -r requirements-dev.in
-pip-tools==5.4.0 \
-    --hash=sha256:a4d3990df2d65961af8b41dacc242e600fdc8a65a2e155ed3d2fc18a5c209f20 \
-    --hash=sha256:b73f76fe6464b95e41d595a9c0302c55a786dbc54b63ae776c540c04e31914fb \
+pip-tools==5.5.0 \
+    --hash=sha256:10841c1e56c234d610d0466447685b9ea4ee4a2c274f858c0ef3c33d9bd0d985 \
+    --hash=sha256:cb0108391366b3ef336185097b3c2c0f3fa115b15098dafbda5e78aef70ea114 \
     # via -r requirements-dev.in
 selenium==3.141.0 \
     --hash=sha256:2d7131d7bc5a5b99a2d9b04aaf2612c411b03b8ca1b1ee8d3de5845a9be2cb3c \
     --hash=sha256:deaf32b60ad91a4611b98d8002757f29e6f2c2d5fcaf202e1c9ad06d6772300d \
     # via helium
-six==1.14.0 \
-    --hash=sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a \
-    --hash=sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c \
-    # via pip-tools
 urllib3==1.25.9 \
     --hash=sha256:3018294ebefce6572a474f0604c2021e33b3fd8006ecd11d62107a5d2a963527 \
     --hash=sha256:88206b0eb87e6d677d424843ac5209e3fb9d0190d0ee169599165ec25e9d9115 \