Workaround for the macOS actions thanks to @winder

.github/workflows/build.yml

@@ -54,13 +54,16 @@ jobs:
              checksum.txt
 
   macos-build:
-    runs-on: macos-latest
+    runs-on: macos-10.15
     steps:
       - name: Checkout
         uses: actions/checkout@v2.0.0
       - name: Install dependencies
         run: |
           brew update || brew update
+          brew uninstall openssl@1.0.2t
+          rm -rf /usr/local/etc/openssl
+          rm -rf /usr/local/etc/openssl@1.1
           brew upgrade
           brew install cmake qt5 ftgl pkg-config fluid-synth
       - name: Define variables