ci: add CI for Python 3.12 and 3.13

Drop support for Python 3.7 and 3.8

Author: iMichka

.github/workflows/tests.yml

@@ -17,63 +17,63 @@ jobs:
           - os: ubuntu-20.04
             compiler: gcc
             version: "9"
-            python-version: "3.7"
+            python-version: "3.9"
             castxml: "castxml"
             castxml-epic: 0
             cppstd: "-std=c++98"
 
           - os: ubuntu-20.04
             compiler: gcc
             version: "9"
-            python-version: "3.8"
+            python-version: "3.10"
             castxml: "castxml"
             castxml-epic: 0
             cppstd: "-std=c++98"
 
           - os: ubuntu-20.04
             compiler: gcc
             version: "9"
-            python-version: "3.9"
+            python-version: "3.11"
             castxml: "castxml"
             castxml-epic: 0
             cppstd: "-std=c++98"
 
           - os: ubuntu-20.04
             compiler: gcc
             version: "9"
-            python-version: "3.10"
+            python-version: "3.12"
             castxml: "castxml"
             castxml-epic: 0
             cppstd: "-std=c++98"
 
           - os: ubuntu-20.04
             compiler: gcc
             version: "9"
-            python-version: "3.11"
+            python-version: "3.13"
             castxml: "castxml"
             castxml-epic: 0
             cppstd: "-std=c++98"
 
           - os: ubuntu-20.04
             compiler: gcc
             version: "9"
-            python-version: "3.8"
+            python-version: "3.13"
             castxml: "castxml"
             castxml-epic: 1
             cppstd: "-std=c++98"
 
           - os: ubuntu-20.04
             compiler: gcc
             version: "9"
-            python-version: "3.8"
+            python-version: "3.13"
             castxml: "castxml"
             castxml-epic: 1
             cppstd: "-std=c++11"
 
           - os: macos-13
             compiler: xcode
             version: "default"
-            python-version: "3.8"
+            python-version: "3.13"
             castxml: "castxml"
             castxml-epic: 0
             cppstd: "-std=c++98"