Pin macOS version on package workflow.

HexDecimal · HexDecimal · commit f1135c3e709b · 2021-09-26T12:31:00.000-07:00
diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
@@ -153,7 +153,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: ["macos-latest"]
+        os: ["macos-10.15"]
         python-version: ["3.x"]
     steps:
       # v2 breaks `git describe` so v1 is needed.
