Updating action to mac os 11

Author: mikechambers

.github/workflows/dcli.yaml

@@ -81,7 +81,7 @@ jobs:
                   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
     build-mac-x86_64:
-        runs-on: macos-10.15
+        runs-on: macos-11
         steps:
             #set some environement variables that we can use through the rest of our
             #action