Bump cairocffi from 1.6.1 to 1.7.0 in /tools

Bumps [cairocffi](https://github.com/Kozea/cairocffi) from 1.6.1 to 1.7.0.
- [Release notes](https://github.com/Kozea/cairocffi/releases)
- [Changelog](https://github.com/Kozea/cairocffi/blob/main/NEWS.rst)
- [Commits](https://github.com/Kozea/cairocffi/compare/v1.6.1...v1.7.0)

---
updated-dependencies:
- dependency-name: cairocffi
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/tools/ci/requirements_build.txt b/tools/ci/requirements_build.txt
index 3016f05..7b4f861 100644
--- a/tools/ci/requirements_build.txt
+++ b/tools/ci/requirements_build.txt
@@ -1,4 +1,4 @@
-cairocffi==1.6.1
+cairocffi==1.7.0
 fonttools==4.51.0
 genshi==0.7.7
 jinja2==3.1.3