Update ci.yml (#504)

Author: Craigacp

.github/workflows/ci.yml

@@ -163,7 +163,7 @@ jobs:
           df -h
   macosx-x86_64:
     if: github.event_name == 'push' || contains(github.event.pull_request.labels.*.name, 'CI build')
-    runs-on: macos-10.15
+    runs-on: macos-11
     needs: prepare
     strategy:
       matrix:
@@ -287,7 +287,7 @@ jobs:
   deploy:
     if: github.event_name == 'push' && contains(github.ref, 'master')
     needs: [linux-x86_64, macosx-x86_64, windows-x86_64]
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
       - name: Configure Java
         uses: actions/setup-java@v2