Bump librt from 0.7.7 to 0.7.8 (#149)

Bumps [librt](https://github.com/mypyc/librt) from 0.7.7 to 0.7.8.
- [Commits](mypyc/librt@v0.7.7...v0.7.8)

---
updated-dependencies:
- dependency-name: librt
  dependency-version: 0.7.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements-dev.txt

@@ -28,7 +28,7 @@ jinja2==3.1.6
     # via
     #   ccs-govuk-frontend-jinja (pyproject.toml)
     #   flask
-librt==0.7.7
+librt==0.7.8
     # via mypy
 lxml==6.0.2
     # via