Move MacX86 runner up to new minimum spec (earlephilhower#2711)

earlephilhower · web-flow · commit 45c0b3a1b4be · 2024-12-21T10:27:44.000-08:00
The MacOS12 runner is dead, so move up to the lowest version still available for CI.
diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
@@ -196,7 +196,7 @@ jobs:
     name: Mac
     strategy:
       matrix:
-        os: [macOS-12, macOS-14]
+        os: [macOS-13, macOS-14]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
