CI: image upgrade to the latest stable

Author: ForNeVeR

.github/workflows/docker.yml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   push:
-    runs-on: 'ubuntu-20.04'
+    runs-on: 'ubuntu-22.04'
     steps:
       - uses: actions/checkout@v2
 

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.image }}
     strategy:
       matrix:
-        image: [macos-10.15, ubuntu-20.04, windows-2019]
+        image: [macos-12, ubuntu-22.04, windows-2022]
     env:
       DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
       DOTNET_CLI_TELEMETRY_OPTOUT: 1