[CI] Remove macos-10.15, because it is deprecated

Author: ViliusSutkus89

.github/workflows/build-test.yml

@@ -59,7 +59,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-18.04, ubuntu-20.04, ubuntu-22.04, macos-10.15, macos-11, macos-12, windows-2019, windows-2022 ]
+        os: [ ubuntu-18.04, ubuntu-20.04, ubuntu-22.04, macos-11, macos-12, windows-2019, windows-2022 ]
 
     steps:
       - uses: actions/checkout@v3