Bump Vampire/setup-wsl from 3 to 7

Bumps [Vampire/setup-wsl](https://github.com/vampire/setup-wsl) from 3 to 7.
- [Release notes](https://github.com/vampire/setup-wsl/releases)
- [Commits](https://github.com/vampire/setup-wsl/compare/v3...v7)

---
updated-dependencies:
- dependency-name: Vampire/setup-wsl
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/smoke-extra.yml

@@ -98,7 +98,7 @@ jobs:
     # WSL2 + Ubuntu so the smoke can run a real linux peer with its own
     # netns. iputils-ping is needed for the in-WSL ping check. WSL1 has no
     # real kernel and would lack /dev/net/tun, so we have to force WSL2.
-    - uses: Vampire/setup-wsl@v3
+    - uses: Vampire/setup-wsl@v7
       with:
         distribution: Ubuntu-24.04
         additional-packages: iputils-ping iproute2