gha: update to crazy-max/ghaction-github-runtime@v3

- Node 20 as default runtime (requires Actions Runner v2.308.0 or later)
- full diff: https://github.com/crazy-max/ghaction-github-runtime/compare/v2.2.0...v3.0.0

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.github/workflows/buildkit.yml

@@ -78,7 +78,7 @@ jobs:
       # https://github.com/moby/buildkit/blob/567a99433ca23402d5e9b9f9124005d2e59b8861/client/client_test.go#L5407-L5411
       -
         name: Expose GitHub Runtime
-        uses: crazy-max/ghaction-github-runtime@v2
+        uses: crazy-max/ghaction-github-runtime@v3
       -
         name: Checkout
         uses: actions/checkout@v4