[release/1.6] Downgrade MinGW to version 10.2.0

There is currently an issue in the race detector in Go on Windows when
used with a newer version of GCC. The issue was first reported here:

golang/go#46099

Fixes containerd#7104

Signed-off-by: Gabriel Adrian Samfira <[email protected]>
(cherry picked from commit 1ef4bda)

Signed-off-by: Kazuyoshi Kato <[email protected]>

Author: gabriel-samfira

.github/workflows/ci.yml

@@ -267,6 +267,14 @@ jobs:
 
       - run: script/setup/install-dev-tools
 
+      # There is currently an issue in the race detector in Go on Windows when
+      # used with a newer version of GCC. The issue was first reported here:
+      # https://github.com/golang/go/issues/46099
+      - name: Downgrade MinGW
+        shell: bash
+        run: |
+          choco install mingw --version 10.2.0 --allow-downgrade
+
       - name: Binaries
         env:
           CGO_ENABLED: 1