BLD: Remove macos-13 (#206)

Author: pllim

.github/workflows/build.yaml

@@ -32,7 +32,7 @@ jobs:
       fail-fast: false
       matrix:
         # the macOS 13 runner is on Intel hardware
-        runs-on: [ ubuntu-latest, macos-13, macos-latest ]
+        runs-on: [ ubuntu-latest, macos-latest ]
         python-version: [ '3.11', '3.12', '3.13' ]
     runs-on: ${{ matrix.runs-on }}
     name: build (Python ${{ matrix.python-version }}, ${{ matrix.runs-on }})

.github/workflows/test.yaml

@@ -33,7 +33,7 @@ jobs:
       matrix:
         package: [ acstools, asdf, ccdproc, costools, jwst, reftools, synphot, wfpc2tools ]
         # the macOS 13 runner is on Intel hardware
-        runs-on: [ ubuntu-latest, macos-13, macos-latest ]
+        runs-on: [ ubuntu-latest, macos-latest ]
         python-version: [ '3.11', '3.12', '3.13' ]
         include:
           - package: acstools