Roughly retry choco install commands

to deal with random failures:
https://github.com/ruby/ruby/runs/210617845

.github/workflows/windows.yml

@@ -31,7 +31,12 @@ jobs:
         env:
           dependencies: openssl readline zlib
       - name: Install libraries with chocolatey
-        run: choco install winflexbison3
+        run: |
+          choco install winflexbison3 || (
+            sleep 4 && choco install winflexbison3
+          ) || (
+            sleep 25 && choco install winflexbison3
+          )
       # Not using official actions/checkout because it's unstable and sometimes doesn't work for a fork.
       - name: Checkout ruby/ruby
         run: git clone --depth=50 https://github.com/ruby/ruby . && git reset --hard ${{ github.sha }}