Disable swift-nio build until apple/swift-nio#3181 is merged

Author: marcprux

.github/workflows/buildmajor.yml

@@ -238,6 +238,8 @@ jobs:
           repository: apple/swift-nio
           path: swift-nio
       - name: Build swift-nio
+        # needed until https://github.com/apple/swift-nio/pull/3181 gets merged
+        if: false
         shell: bash
         working-directory: swift-nio
         run: |