Remove old images

Author: mdenker

.github/workflows/CI.yml

@@ -134,7 +134,7 @@ jobs:
       fail-fast: false
       matrix:
         # OS [ubuntu-latest, macos-latest, windows-latest]
-        os: [macos-13,macos-14]
+        os: [macos-14,macos-15]
         python-version: [3.12]
     steps:
       - name: Get current year-month

.github/workflows/build_wheels.yml

@@ -15,7 +15,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, windows-2019]
+        #os: [ubuntu-20.04, windows-2019]
+        os: [ubuntu-latest, windows-latest]
 
     steps:
       - uses: actions/checkout@v4