Upgrade from mac 13 to mac 15 due to deprecation (#1272)

Author: sirknightj

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ on:
 
 jobs:
   mac-os-build-clang:
-    runs-on: macos-13
+    runs-on: macos-15-intel
     env:
       AWS_KVS_LOG_LEVEL: 2
     permissions:
@@ -47,7 +47,7 @@ jobs:
           ./tst/producerTest
 
   mac-os-build-gcc:
-    runs-on: macos-13
+    runs-on: macos-15-intel
     strategy:
       matrix:
         parallel-build:

.github/workflows/samples.yml

@@ -65,8 +65,8 @@ jobs:
           - name: kvssink_intermittent_sample # There is no file source option for this sample (will use gst videotestsrc).
             args: testsrc 120 # <gst-videotestsrc> <sample_duration_seconds>
         runner:
-          - id: macos-13
-            image: macos-13
+          - id: macos-15-intel
+            image: macos-15-intel
 
           - id: ubuntu-22.04
             image: ubuntu-latest