Python.h missing on 3.9 and 3.10

[mkcms]

Description:
A few days ago my builds with Python 3.9 and 3.10 broke due to a missing Python.h include in one of the dependent packages that I build during the process. The same setup builds fine for 3.11, 3.12 and 3.13, and it used to work before that for 3.9 and 3.10 as well.

As far as I know, no changes were made to the dependent package.

Example failing job: https://github.com/mkcms/bdx/actions/runs/12715895623/job/35449032864

A successful build from a week ago: https://github.com/mkcms/bdx/actions/runs/12610330973/job/35144803933

Action version:
Latest master

Platform:

• Ubuntu
• macOS
• Windows

Runner type:

• Hosted
• Self-hosted

Tools version:

• 3.9
• 3.10

Repro steps:
Try to compile a C Python extension that uses Python.h header.

Expected behavior:
No error.

Actual behavior:
The Python.h header can't be found.

libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I../../python3 -I.. -I/opt/hostedtoolcache/Python/3.10.15/x64/include/python3.10 -fno-strict-aliasing -Wall -Wno-unused -Wno-uninitialized -fvisibility=hidden -fvisibility-inlines-hidden -g -O2 -MT xapian_wrap.lo -MD -MP -MF .deps/xapian_wrap.Tpo -c ../../python3/xapian_wrap.cc  -fPIC -DPIC -o .libs/xapian_wrap.o
../../python3/xapian_wrap.cc:20:10: fatal error: Python.h: No such file or directory
   20 | #include <Python.h>