fixes nim caching in ci

Author: jangko

.github/workflows/ci.yml

@@ -82,11 +82,12 @@ jobs:
         shell: bash
         run: |
           mkdir -p external
+          MINGW_BASE="https://github.com/brechtsanders/winlibs_mingw/releases/download/11.2.0-12.0.1-9.0.0-r1"
           if [[ '${{ matrix.target.cpu }}' == 'amd64' ]]; then
-            MINGW_URL="https://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Personal%20Builds/mingw-builds/8.1.0/threads-posix/seh/x86_64-8.1.0-release-posix-seh-rt_v6-rev0.7z"
+            MINGW_URL="$MINGW_BASE/winlibs-x86_64-posix-seh-gcc-11.2.0-mingw-w64-9.0.0-r1.7z"
             ARCH=64
           else
-            MINGW_URL="https://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win32/Personal%20Builds/mingw-builds/8.1.0/threads-posix/dwarf/i686-8.1.0-release-posix-dwarf-rt_v6-rev0.7z"
+            MINGW_URL="$MINGW_BASE/winlibs-i686-posix-dwarf-gcc-11.2.0-mingw-w64-9.0.0-r1.7z"
             ARCH=32
           fi
           curl -L "$MINGW_URL" -o "external/mingw-${{ matrix.target.cpu }}.7z"
@@ -126,7 +127,7 @@ jobs:
         uses: actions/cache@v2
         with:
           path: NimBinaries
-          key: 'NimBinaries-${{ matrix.target.os }}-${{ matrix.target.cpu }}-${{ steps.versions.outputs.nimbus_build_system }}'
+          key: '${{ matrix.test_lang }}-${{ matrix.target.os }}-${{ matrix.target.cpu }}-${{ steps.versions.outputs.nimbus_build_system }}'
 
       - name: Build Nim and associated tools
         shell: bash