fix server_version memory management

[pabloandresm]

these fixes repair issue #19 and issue #20

I've stress-tested everything in deep.

[khoih-prog]

Hi @pabloandresm

Thanks for your PR. I've reviewed, so far so good, and am merging now. Will publish a new release soon.

Best,

[khoih-prog]

Hi @pabloandresm

The new MySQL_MariaDB_Generic releases v1.6.1 has just been published. Your contribution is noted in Contributions and Thanks

Please have some more tests to verify the bugs have been squashed and if there is any more bug.

The library have been much better now, thanks to your contributions.

Best Regards,

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Release v1.6.1

1. Fix memory management bugs. Check corrupt heap at MySQL_Connection destructor #19 and malloc server_version result not correctly handled may lead to memory corruption #20
2. Add support to SAMD21/SAMD51 boards using Fab_SAM_Arduino core
3. Add support to RP2040 boards using Seeed RP2040 core
4. Add Packages' Patches for Fab_SAM_Arduino core