Bump pip-tools from 5.3.1 to 5.4.0

Bumps [pip-tools](https://github.com/jazzband/pip-tools) from 5.3.1 to 5.4.0.
- [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/5.3.1...5.4.0)

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

requirements-dev.in

@@ -1,3 +1,3 @@
 pdoc3==0.9.1
-pip-tools==5.3.1
+pip-tools==5.4.0
 helium==3.0.5

requirements-dev.txt

@@ -56,9 +56,9 @@ markupsafe==1.1.1 \
 pdoc3==0.9.1 \
     --hash=sha256:e1848d5485b8dd4662272f83bb5f7df4a68e0a5d76c87be30327977777168894 \
     # via -r requirements-dev.in
-pip-tools==5.3.1 \
-    --hash=sha256:5672c2b6ca0f1fd803f3b45568c2cf7fadf135b4971e7d665232b2075544c0ef \
-    --hash=sha256:73787e23269bf8a9230f376c351297b9037ed0d32ab0f9bef4a187d976acc054 \
+pip-tools==5.4.0 \
+    --hash=sha256:a4d3990df2d65961af8b41dacc242e600fdc8a65a2e155ed3d2fc18a5c209f20 \
+    --hash=sha256:b73f76fe6464b95e41d595a9c0302c55a786dbc54b63ae776c540c04e31914fb \
     # via -r requirements-dev.in
 selenium==3.141.0 \
     --hash=sha256:2d7131d7bc5a5b99a2d9b04aaf2612c411b03b8ca1b1ee8d3de5845a9be2cb3c \