fix: github actions luarocks upload

## Details

Most likely failing due to the version of ubuntu we're running on not
working with `tree-sitter-cli`. Update runner and checkout action while
we're at it.

Author: MeanderingProgrammer

.github/workflows/luarocks.yml

@@ -8,10 +8,10 @@ on:
 
 jobs:
   luarocks-upload:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # Required to get the tags