downgrade macos and linux (#2098)

.github/workflows/build.yml

@@ -8,7 +8,7 @@ on:
       - "v*"
 jobs:
   linux:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
         with:
@@ -141,7 +141,7 @@ jobs:
           name: inkstitch-windows
           path: artifacts
   mac:
-    runs-on: macos-latest
+    runs-on: macos-11
     steps:
       - uses: actions/checkout@v3
         with: