fix: pin client SDK macOS jobs to macos-15 for Xcode 16.2

Author: mattrmc1

.github/workflows/release-sdk-client.yml

@@ -17,7 +17,7 @@ on:
 jobs:
 # Building is done on mac runner due to xcode build dependencies
   build:
-    runs-on: macos-latest
+    runs-on: macos-15
     permissions:
       id-token: write
       contents: write
@@ -112,7 +112,7 @@ jobs:
 
 # Packing is done on Mac due to ios workload requirements.
   publish:
-    runs-on: macos-latest
+    runs-on: macos-15
     needs: sign-dlls
     permissions:
       id-token: write

.github/workflows/sdk-client-ci.yml

@@ -13,7 +13,7 @@ jobs:
   build-and-test:
     strategy:
       matrix:
-        os: [macos-latest]
+        os: [macos-15]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     permissions: