merge stable

[ibuclaw]

• Rename gdb test case file such that it starts by "gdb" like the other gdb tests. (this enables disabling the test when gdb is not available on the test system) (Rename gdb test case file such that it starts by "gdb" like the other… #16458)
• bump VERSION to v2.109.0-beta.1

[dlang-bot]

Thanks for your pull request, @ibuclaw!

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dub run digger -- build "master + dmd#16468"