chore(deps): bump tinycss2 from 1.4.0 to 1.5.1

Bumps [tinycss2](https://github.com/Kozea/tinycss2) from 1.4.0 to 1.5.1.
- [Release notes](https://github.com/Kozea/tinycss2/releases)
- [Changelog](https://github.com/Kozea/tinycss2/blob/main/docs/changelog.rst)
- [Commits](Kozea/tinycss2@v1.4.0...v1.5.1)

---
updated-dependencies:
- dependency-name: tinycss2
  dependency-version: 1.5.1
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/docs-blog.txt

@@ -701,9 +701,9 @@ smmap==5.0.2 \
     --hash=sha256:26ea65a03958fa0c8a1c7e8c7a58fdc77221b8910f6be2131affade476898ad5 \
     --hash=sha256:b30115f0def7d7531d22a0fb6502488d879e75b260a9db4d0819cfb25403af5e
     # via gitdb
-tinycss2==1.4.0 \
-    --hash=sha256:10c0972f6fc0fbee87c3edb76549357415e94548c1ae10ebccdea16fb404a9b7 \
-    --hash=sha256:3a49cf47b7675da0b15d0c6e1df8df4ebd96e9394bb905a5775adb0d884c5289
+tinycss2==1.5.1 \
+    --hash=sha256:3415ba0f5839c062696996998176c4a3751d18b7edaaeeb658c9ce21ec150661 \
+    --hash=sha256:d339d2b616ba90ccce58da8495a78f46e55d4d25f9fd71dfd526f07e7d53f957
     # via
     #   cairosvg
     #   cssselect2