[github] Update to Node.js v27 as the new nightly version

Node.js v26 branched, the new nightly version is v27.
we need to stay up-to-date to be able to test new V8 features.

Change-Id: I4eea87f24cfff0e2cb48cb21904d6c0c5bb97421
Reviewed-on: https://chrome-internal-review.googlesource.com/c/v8/fuzzilli/+/9317781
Commit-Queue: Marja Hölttä <marja@google.com>
Reviewed-by: Marja Hölttä <marja@google.com>
Auto-Submit: Matthias Liedtke <mliedtke@google.com>

Author: Liedtke

.github/workflows/swift.yml

@@ -25,7 +25,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v4
         with:
-          node-version: 26-nightly
+          node-version: 27-nightly
       - name: Swift Version
         run: swift --version
       - uses: actions/checkout@v2