updated github and appveyor configs

.appveyor.yml

@@ -44,7 +44,7 @@ for:
       only:
         - job_name: windows
     test_script:
-      - cmd: call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvars64.bat"
+      - cmd: call "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvars64.bat"
       - cmd: git clone "https://github.com/libtom/libtommath.git" --depth 1 && cd "libtommath"
       - cmd: nmake -f "makefile.msvc" install && cd ..
       - cmd: set "INCLUDE=C:\devel\include;%INCLUDE%" && set "LIB=C:\devel\lib;%LIB%" && set "PATH=C:\devel\bin;%PATH%"

.github/workflows/cmake.yml

@@ -5,7 +5,7 @@ on:
 
 jobs:
   ubuntu:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -17,7 +17,7 @@ jobs:
           CI: True
 
   macos:
-    runs-on: macos-latest
+    runs-on: macos-11
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -29,7 +29,7 @@ jobs:
           CI: True
 
   windows:
-    runs-on: windows-latest
+    runs-on: windows-2022
     defaults:
       run:
         shell: cmd
@@ -38,7 +38,7 @@ jobs:
         uses: actions/checkout@v2
       - name: Coverage toolchains
         run: |
-          call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
+          call "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
           git clone "https://github.com/libtom/libtommath.git" --depth 1 && cd "libtommath"
           nmake -f "makefile.msvc" install && cd ..
           set "INCLUDE=C:\devel\include;%INCLUDE%" && set "LIB=C:\devel\lib;%LIB%" && set "PATH=C:\devel\bin;%PATH%"
@@ -47,7 +47,7 @@ jobs:
           CI: True
 
   windows-mingw:
-    runs-on: windows-latest
+    runs-on: windows-2022
     defaults:
       run:
         shell: msys2 "{0}"
@@ -73,7 +73,7 @@ jobs:
           MSYSTEM: MINGW64
 
   windows-cygwin:
-    runs-on: windows-latest
+    runs-on: windows-2022
     defaults:
       run:
         shell: cmd