fix(ci): use x64 runner for macos x64 (#2645)

.github/workflows/insider-macos.yml

@@ -44,7 +44,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - runner: macos-14
+          - runner: macos-15-intel
             vscode_arch: x64
           - runner: [self-hosted, macOS, ARM64]
             vscode_arch: arm64

.github/workflows/stable-macos.yml

@@ -43,7 +43,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - runner: macos-14
+          - runner: macos-15-intel
             vscode_arch: x64
           - runner: [self-hosted, macOS, ARM64]
             vscode_arch: arm64