build(deps): bump leafo/gh-actions-lua from 8 to 12

Bumps [leafo/gh-actions-lua](https://github.com/leafo/gh-actions-lua) from 8 to 12.
- [Release notes](https://github.com/leafo/gh-actions-lua/releases)
- [Commits](leafo/gh-actions-lua@v8...v12)

---
updated-dependencies:
- dependency-name: leafo/gh-actions-lua
  dependency-version: '12'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/publish.yaml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Set up Lua
-        uses: leafo/gh-actions-lua@v8
+        uses: leafo/gh-actions-lua@v12
         with:
           luaVersion: '5.3.5'