Update to Python 3.13, NLopt 2.9.0

Author: DanielBok

.github/workflows/build.yml

@@ -22,7 +22,7 @@ jobs:
     strategy:
       fail-fast: False
       matrix:
-        python-version: [ '3.9', '3.10', '3.11', '3.12' ]
+        python-version: [ '3.9', '3.10', '3.11', '3.12', '3.13' ]
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -91,7 +91,7 @@ jobs:
     strategy:
       matrix:
         os: [ windows-latest, ubuntu-latest, macos-latest, macos-14 ]
-        python-version: [ '3.9', '3.10', '3.11', '3.12' ]
+        python-version: [ '3.9', '3.10', '3.11', '3.12', '3.13' ]
 
     steps:
       - name: Checkout repository