Remove macOS 13 pin on GH actions (#9673)

Author: hssyoo

.github/workflows/run-dep-tests.yml

@@ -13,8 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
-        # macOS pinned to 13 due to 14+ defaulting to arm64 hardware
-        os: [ubuntu-latest, macOS-13, windows-latest]
+        os: [ubuntu-latest, macOS-latest, windows-latest]
 
     steps:
     - uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608

.github/workflows/source-dist-tests.yml

@@ -14,8 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
-        # macOS pinned to 13 due to 14+ defaulting to arm64 hardware
-        os: [ubuntu-latest, macOS-13, windows-latest]
+        os: [ubuntu-latest, macOS-latest, windows-latest]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}