gateway: bump mlugg/setup-zig from 2.0.1 to 2.0.5

Bumps [mlugg/setup-zig](https://github.com/mlugg/setup-zig) from 2.0.1 to 2.0.5.
- [Release notes](https://github.com/mlugg/setup-zig/releases)
- [Commits](mlugg/setup-zig@7dccf5e...8d6198c)

---
updated-dependencies:
- dependency-name: mlugg/setup-zig
  dependency-version: 2.0.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/dummy.yml

@@ -75,4 +75,4 @@ jobs:
       - uses: uraimo/run-on-arch-action@d94c13912ea685de38fccc1109385b83fd79427d  # v3.0.1
       - uses: vimtor/action-zip@5f1c4aa587ea41db1110df6a99981dbe19cee310  # v1
       - uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a  # v2.1.1
-      - uses: mlugg/setup-zig@7dccf5e6d09267c55f815f2db29495f30ba2ebca  # v2.0.1
+      - uses: mlugg/setup-zig@8d6198c65fb0feaa111df26e6b467fea8345e46f  # v2.0.5