CI : Remove macos-arm64 job

We'll be able to reinstate it at some point in the future when macOS builds of dependencies-10.x.x are available.

Author: murraystevenson

.github/workflows/main.yml

@@ -33,8 +33,7 @@ jobs:
           linux-gcc11,
           linux-debug-gcc11,
           windows,
-          windows-debug,
-          macos-arm64
+          windows-debug
         ]
 
         include:
@@ -77,15 +76,6 @@ jobs:
             publish: false
             jobs: 4
 
-          - name: macos-arm64
-            os: macos-14
-            buildType: RELEASE
-            options: .github/workflows/main/options.posix
-            dependenciesURL: https://github.com/GafferHQ/dependencies/releases/download/9.1.0/gafferDependencies-9.1.0-macos-arm64.tar.gz
-            tests: testCore testCorePython testScene testImage testAlembic testUSD testVDB
-            publish: true
-            jobs: 3
-
     runs-on: ${{ matrix.os }}
 
     container: ${{ matrix.containerImage }}