test: disable Python 3.13 CI xapian build. Fails with compile error.

...
libtool: compile:  g++ -DHAVE_CONFIG_H
-I. -I.. -I/opt/hostedtoolcache/Python/3.13.0-alpha.6/x64/include/python3.13
-fno-strict-aliasing -Wall -Wno-unused -Wno-uninitialized
-fvisibility=hidden -g -O2 -MT xapian_wrap.lo -MD -MP -MF
.deps/xapian_wrap.Tpo -c xapian_wrap.cc  -fPIC -DPIC -o
.libs/xapian_wrap.o
xapian_wrap.cc: In constructor
‘XapianSWIG_Python_Thread_Block::XapianSWIG_Python_Thread_Block()’:
xapian_wrap.cc:87:13: error: ‘PyEval_ThreadsInitialized’ was not
declared in this scope
   87 |         if (PyEval_ThreadsInitialized()) {
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~
xapian_wrap.cc: In constructor
‘XapianSWIG_Python_Thread_Allow::XapianSWIG_Python_Thread_Allow()’:
xapian_wrap.cc:109:47: error: ‘PyEval_ThreadsInitialized’ was not
declared in this scope
  109 |     XapianSWIG_Python_Thread_Allow() :
  status(PyEval_ThreadsInitialized()) {
      |
      ^~~~~~~~~~~~~~~~~~~~~~~~~
make[3]: *** [Makefile:782: xapian_wrap.lo] Error 1

.github/workflows/ci-test.yml

@@ -52,12 +52,13 @@ jobs:
         # Run in all these versions of Python
         python-version:
           # - "2.7"
-          - "3.10"
-          # - "3.9"
-          - "3.8"
+          - "3.12"
+          # - 3.6 run via include on ubunto 20.04
           # - "3.7"
+          - "3.8"
+          # - "3.9"
+          - "3.10"
           - "3.11"
-          - "3.12"
 
         # use for multiple os or ubuntu versions
         #os: [ubuntu-latest, macos-latest, windows-latest]
@@ -250,7 +251,7 @@ jobs:
             diff -u configure.FCS configure || true; \
             ./configure --prefix=$VIRTUAL_ENV --with-python3 --disable-documentation; \
           fi
-          case "$PYTHON_VERSION" in nightly) echo skipping xapian build;; *) make && sudo make install; esac
+          case "$PYTHON_VERSION" in "3.13*") echo skipping xapian build;; *) make && sudo make install; esac
 
       - name: Test build roundup and install locale so lang tests work.
         run: |