Adding sdk_version to mac builds for dart-internal.

The osx_sdk version isn't getting propagated to the sub-builds,
so adding a property to pass it in.

Bug:b/232552448

Author: yusuf-goog

.ci.yaml

@@ -331,13 +331,15 @@ targets:
     recipe: engine_v2/engine_v2
     timeout: 60
     properties:
+      sdk_version: 14a5294e
       config_name: mac_android_aot_engine
 
   - name: Mac mac_host_engine
     recipe: engine_v2/engine_v2
     timeout: 60
     properties:
       release_build: "true"
+      sdk_version: 14a5294e
       config_name: mac_host_engine
 
   - name: Mac Unopt
@@ -431,6 +433,7 @@ targets:
     timeout: 60
     properties:
       release_build: "true"
+      sdk_version: 14a5294e
       config_name: mac_ios_engine
       dependencies: >-
         [
@@ -441,12 +444,14 @@ targets:
     recipe: engine_v2/engine_v2
     timeout: 60
     properties:
+      sdk_version: 14a5294e
       config_name: mac_ios_engine_profile
 
   - name:  Mac mac_ios_engine_release
     recipe: engine_v2/engine_v2
     timeout: 60
     properties:
+      sdk_version: 14a5294e
       config_name: mac_ios_engine_release
 
   - name: Windows Android AOT Engine