MacOS CI has been flakey for months, taking 2 or 3 attempts on every PR before it finally passes. Disabled it.

.github/workflows/main.yml

@@ -13,7 +13,6 @@ jobs:
     name: Test
     runs-on: ${{ matrix.os }}
     strategy:
-      max-parallel: 2
       fail-fast: false
       matrix:
         build: [linux-release, windows-release, osx-release]
@@ -21,9 +20,10 @@ jobs:
           - build: linux-release
             os: ubuntu-latest
             config: release
-          - build: osx-release
-            os: macos-latest
-            config: release
+          # Disabled MacOS CI (2024-04-14) because it's been unstable for months. Try enabling this again in 6 months to see if it's working now.
+          #- build: osx-release
+          #  os: macos-latest
+          #  config: release
           - build: windows-release
             os: windows-2019
             config: release