Use mc-runtime-test@main and re-enable 26.1.2 client test

Agent-Logs-Url: https://github.com/CyclopsMC/packtests/sessions/a7b5c233-53a2-4583-9135-4ecb6a71ced4

Co-authored-by: rubensworks <440384+rubensworks@users.noreply.github.com>

Author: Copilot

.github/workflows/gametests.yml

@@ -64,9 +64,9 @@ jobs:
           GITHUB_USER: ${{ github.actor }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: 'Test in runtime client'
-        if: matrix.env == 'client' && (matrix.loader != 'forge' && matrix.loader != 'fabric') && matrix.mc != '26.1.2' # This does not work yet on Forge, Fabric, or mc 26.1.2 (no mc-runtime-test asset available)
+        if: matrix.env == 'client' && (matrix.loader != 'forge' && matrix.loader != 'fabric') # This does not work yet on Forge or Fabric
         timeout-minutes: 10
-        uses: headlesshq/mc-runtime-test@4.3.1
+        uses: headlesshq/mc-runtime-test@main
         with:
           mc: ${{ matrix.mc }}
           modloader: ${{ matrix.loader }}