PHPC-869: Use macOS 10.14 host

Author: jmikola

.evergreen/config.yml

@@ -641,9 +641,9 @@ axes:
       - id: ubuntu1604-arm64
         display_name: "Ubuntu 16.04 ARM64"
         run_on: ubuntu1604-arm64-large
-      - id: osx-1013
-        display_name: "Mac OS 10.13"
-        run_on: osx-1010
+      - id: macos-1014
+        display_name: "Mac OS 10.14"
+        run_on: macos-1014
 
   - id: storage-engine
     display_name: Storage