ci: Extend timeout for tests on Windows

Author: galargh

.github/actions/go-test-setup/action.yml

@@ -7,3 +7,7 @@ runs:
     - name: Install go-ipfs
       shell: bash
       run: (cd /tmp && go install github.com/ipfs/go-ipfs/cmd/ipfs@master)
+    - if: ${{ runner.os == 'Windows' }}
+      name: Extend timeout for tests
+      shell: bash
+      run: echo "GOFLAGS=$GOFLAGS -timeout=20m" >> $GITHUB_ENV