[macOS] add gcc 13 to macos images (#8563)

Author: sergei-pyshnoi

images/macos/toolsets/toolset-12.json

@@ -218,7 +218,8 @@
     "gcc": {
         "versions": [
             "11",
-            "12"
+            "12",
+            "13"
         ]
     },
     "toolcache": [

images/macos/toolsets/toolset-13.json

@@ -85,7 +85,8 @@
     "gcc": {
         "versions": [
             "11",
-            "12"
+            "12",
+            "13"
         ]
     },
     "dotnet": {