Rename "macos-14" to "macos-latest" now pip runners have migrated

.github/workflows/ci.yml

@@ -109,7 +109,7 @@ jobs:
       matrix:
         # Run on both x86 and Arm MacOS according to:
         # https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories
-        os: [ubuntu-latest, macos-12, macos-14]
+        os: [ubuntu-latest, macos-12, macos-latest]
         python:
           - "3.8"
           - "3.9"
@@ -118,9 +118,9 @@ jobs:
           - "3.12"
         exclude:
           # MacOS Arm supports Python 3.10+
-          - os: macos-14
+          - os: macos-latest
             python: "3.8"
-          - os: macos-14
+          - os: macos-latest
             python: "3.9"
 
     steps:
@@ -141,7 +141,7 @@ jobs:
         run: brew install breezy
 
       - name: Install MacOS Arm dependencies
-        if: matrix.os == 'macos-14'
+        if: matrix.os == 'macos-latest'
         run: |
           brew install breezy
           brew install subversion