CI Update: Enable python 3.14 beta, 3.13 is no longer dev

[hannob]

This updates the CI to test with python 3.14 beta/rc versions, and moves 3.13-dev to 3.13, as this is now a stable version.

[hannob]

I just updated the PR, as in the meantime, Github's default for 3.x is already on 3.14, so no need to have that separately, and I also bumped the github actions versions. However, it appears the tests now fail with the 3.x/3.14 version.

[gordonmessmer]

Test failures on python3.14 can be reproduced with a simple test case:

#!/usr/bin/python3

import dbm

def makedbm():
    newdbm = dbm.open('config.dat', 'c')
    newdbm["key"] = "value"

def opendbm():
    config_dbm = dbm.open('config.dat', 'r')
    return config_dbm

makedbm()
mydbm = opendbm()
if("key" in mydbm):
    print("found")

Output from the script is similar to the test logs:

# python3 test.py 
Traceback (most recent call last):
  File "/usr/lib64/python3.14/dbm/sqlite3.py", line 83, in _execute
    return closing(self._cx.execute(*args, **kwargs))
                   ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
sqlite3.OperationalError: no such table: Dict

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/gordon/python-dbm-testcase/test.py", line 15, in <module>
    if("key" in mydbm):
       ^^^^^^^^^^^^^^
  File "<frozen _collections_abc>", line 801, in __contains__
  File "/usr/lib64/python3.14/dbm/sqlite3.py", line 93, in __getitem__
    with self._execute(LOOKUP_KEY, (key,)) as cu:
         ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.14/dbm/sqlite3.py", line 85, in _execute
    raise error(str(exc))
dbm.sqlite3.error: no such table: Dict

This only fails with sqlite3 dbm files that are created by 3.14. If I run the same test case with 3.13 in that directory, it actually repairs the config.dat file, which allows the test to run normally under 3.14.

[gordonmessmer]

However, this test case does not fail:

#!/usr/bin/python3

import dbm

with dbm.open('config.dat', 'c') as newdbm:
    newdbm["key"] = "value"
    if("key" in newdbm):
        print("found")

[gordonmessmer]

Please rebase on the updated main branch.