Revert "[ci] Use sccache with msys2"

This reverts commit b9646dfd62.

For some reason using sccache re-introduces the random CI crashes that
was previously fixed in 80dd751564.

.github/workflows/msys2-ci.yml

@@ -33,10 +33,6 @@ jobs:
         shell: msys2 {0}
     steps:
       - uses: actions/checkout@v3
-      - uses: hendrikmuhs/ccache-action@v1.2
-        with:
-          variant: sccache
-          key: ${{ github.job }}-${{ matrix.MSYSTEM }}-${{ matrix.MSYS2_ARCH }}
       - uses: msys2/setup-msys2@v2
         with:
           msystem: ${{ matrix.MSYSTEM }}
@@ -61,8 +57,6 @@ jobs:
           pip install --upgrade fonttools
       - name: Build
         run: |
-          export PATH=$PATH:$(cygpath -u $USERPROFILE/.cargo/bin)
-          sccache --version
           meson build \
             --wrap-mode=nodownload \
             --auto-features=enabled \