deps: bump astral-sh/setup-uv from 6.4.1 to 6.4.3

Bumps [astral-sh/setup-uv](https://github.com/astral-sh/setup-uv) from 6.4.1 to 6.4.3.
- [Release notes](https://github.com/astral-sh/setup-uv/releases)
- [Commits](astral-sh/setup-uv@7edac99...e92bafb)

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

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

Author: dependabot[bot]

.github/workflows/zizmor.yml

@@ -39,7 +39,7 @@ jobs:
         with:
           persist-credentials: false
 
-      - uses: astral-sh/setup-uv@7edac99f961f18b581bbd960d59d049f04c0002f # v6.4.1
+      - uses: astral-sh/setup-uv@e92bafb6253dcd438e0484186d7669ea7a8ca1cc # v6.4.3
 
       - run: uvx zizmor --persona pedantic --format sarif . > results.sarif
         env: