[issue37382] Improve conditional check for test_gdb

[Jeroen Demeyer]

Jeroen Demeyer <J.Demeyer at UGent.be> added the comment:

> if a change like that is pushed, all the fleet has to be monitored for potential failures, as there are many older OSes supported there.

If this breaks some buildbots, then we can find out more precisely under which conditions they fail. For example, if they fail when GDB is older than a certain version, we can adjust the tests to check for that version.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37382>
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