Bump pip-tools from 5.0.0 to 5.1.2

Bumps [pip-tools](https://github.com/jazzband/pip-tools) from 5.0.0 to 5.1.2.
- [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/5.0.0...5.1.2)

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

requirements-dev.in

@@ -1,3 +1,3 @@
 pdoc3==0.8.1
-pip-tools==5.0.0
+pip-tools==5.1.2
 helium==3.0.2

requirements-dev.txt

@@ -56,9 +56,9 @@ markupsafe==1.1.1 \
 pdoc3==0.8.1 \
     --hash=sha256:d7b56e67b5e049d53dcde94245a28040b640b2e06c344fc58ab2bdf2d91dc00f \
     # via -r requirements-dev.in
-pip-tools==5.0.0 \
-    --hash=sha256:2045d0414e9db71c036443efa229ff1b76dfe47a3cb022d6154a1c9e207f0867 \
-    --hash=sha256:4fdc317a331de8affe481509d7efea7e72fc5cca6c9f6cacbe778617680961fe \
+pip-tools==5.1.2 \
+    --hash=sha256:111ec415d3776498c8c1a8596ae9651160d17ea93303a70f25aa1f8de3d1a47b \
+    --hash=sha256:a524452490f9dc888f55bef73846db2aa27041aaa72e232913d75ea732f6acc9 \
     # via -r requirements-dev.in
 selenium==3.141.0 \
     --hash=sha256:2d7131d7bc5a5b99a2d9b04aaf2612c411b03b8ca1b1ee8d3de5845a9be2cb3c \