Remove build steps

Author: texodus

.github/workflows/build.yml

@@ -19,7 +19,6 @@ on:
       - docs/
       - examples/
       - python/perspective/README.md
-  pull_request:
   workflow_dispatch:
     inputs:
       ci-full:
@@ -765,12 +764,12 @@ jobs:
           - is-full-run: false
             os: windows-2019
 
-          # Exclude Macos 10.11 bulds
+          # Exclude Macos bulds
           - is-full-run: false
             os: macos-10.15
 
           - is-full-run: false
-            os: macos-10.11
+            os: macos-11
 
           # Exclude Python 3.7 and 3.8 builds
           - is-full-run: false
@@ -1247,6 +1246,9 @@ jobs:
             os: macos-10.15
 
           # Exclude Python 3.7 and 3.8 builds
+          - is-full-run: false
+            os: macos-11
+
           - is-full-run: false
             python-version: 3.7