update macOs version in unit-tests

Author: KirillKurdyukov

.github/workflows/tests.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-22.04, windows-2022, macos-12 ]
+        os: [ ubuntu-22.04, windows-2022, macos-15 ]
         dotnet-version: [ 6.0.x, 7.0.x ]
         include:
           - dotnet-version: 6.0.x
@@ -192,4 +192,4 @@ jobs:
       - name: Run Dapper example
         run: |
           cd ./examples/src/DapperExample
-          dotnet run
+          dotnet run