build(python): add support for Python 3.13 (#472)

[jlemesh]

Closes reanahub/reana#837

Add support for Python 3.13.

[codecov]

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[tiborsimko]

BTW locally I'm seeing:

$ pip install tox --upgrade
$ tox -e py313
...
      gcc -fno-strict-overflow -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DNDEBUG -fexceptions -fcf-protection -fexceptions -fcf-protection -fexceptions -fcf-protection -O3 -fPIC "-DPSYCOPG_VERSION=2.9.9 (dt dec pq3 ext lo64)" -DPSYCOPG_DEBUG=1 -DPG_VERSION_NUM=160004 -DHAVE_LO64=1 -DPSYCOPG_DEBUG=1 -I/home/tibor/private/project/reana/src/reana-commons/.tox/py313/include -I/usr/include/python3.13 -I. -I/usr/include -I/usr/include/pgsql/server -c psycopg/utils.c -o build/temp.linux-x86_64-cpython-313/psycopg/utils.o -Wdeclaration-after-statement
      psycopg/utils.c: In function ‘psyco_is_main_interp’:
      psycopg/utils.c:397:12: error: implicit declaration of function ‘_PyInterpreterState_Get’; did you mean ‘PyInterpreterState_Get’? [-Wimplicit-function-declaration]

but this should not be a blocker for merge since DB is not used much for the "client" side and Python 3.13 is used on the cluster side.

Besides, the CI is all green :)