Use pre-installed OpenSSL for Windows CI

Author: jlaine

.github/workflows/tests.yml

@@ -73,9 +73,9 @@ jobs:
       - name: Install OpenSSL
         if: matrix.os == 'windows-latest'
         run: |
-          choco install openssl --no-progress
+          # OpenSSL is pre-installed on windows-2025 runners.
           echo "INCLUDE=C:\Progra~1\OpenSSL\include" >> $GITHUB_ENV
-          echo "LIB=C:\Progra~1\OpenSSL\lib" >> $GITHUB_ENV
+          echo "LIB=C:\Progra~1\OpenSSL\\lib\\VC\\x64\\MD" >> $GITHUB_ENV
         shell: bash
       - name: Run tests
         run: |