chore: Update GHA dep: Bump astral-sh/setup-uv from 6.0.1 to 6.4.3

Bumps [astral-sh/setup-uv](https://github.com/astral-sh/setup-uv) from 6.0.1 to 6.4.3.
- [Release notes](https://github.com/astral-sh/setup-uv/releases)
- [Commits](astral-sh/setup-uv@6b9c606...e92bafb)

---
updated-dependencies:
- dependency-name: astral-sh/setup-uv
  dependency-version: 6.4.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/zizmor.yml

@@ -23,7 +23,7 @@ jobs:
           persist-credentials: false
 
       - name: Install the latest version of uv
-        uses: astral-sh/setup-uv@6b9c6063abd6010835644d4c2e1bef4cf5cd0fca # v6.0.1
+        uses: astral-sh/setup-uv@e92bafb6253dcd438e0484186d7669ea7a8ca1cc # v6.4.3
 
       - name: Run zizmor 🌈
         run: uvx zizmor --format=sarif . > results.sarif