update the release action to build specs with KHR and EXT extensions (#1356)

Author: bashbaug

.github/workflows/release.yml

@@ -43,7 +43,7 @@ jobs:
 
       - name: Build Specs
         run: |
-            python3 makeSpec -clean -spec core OUTDIR=out.release -j 5 api c env ext cxx4opencl
+            python3 makeSpec -clean -spec khr+ext OUTDIR=out.release -j 5 api c env ext cxx4opencl
 
       - name: Release Specs
         uses: softprops/action-gh-release@c95fe1489396fe8a9eb87c0abf8aa5b2ef267fda # v2.2.1