fix: Remove retired runner

Author: tmathern

.github/workflows/build.yml

@@ -367,8 +367,6 @@ jobs:
             runs-on: macos-latest
           - target: arm64
             runs-on: macos-latest
-          - target: x86_64
-            runs-on: macos-13
 
     if: |
       github.event_name != 'pull_request' ||
@@ -386,8 +384,6 @@ jobs:
         include:
           - target: arm64
             runs-on: macos-latest
-          - target: x86_64
-            runs-on: macos-13
 
     if: |
       github.event_name != 'pull_request' ||