jdp-2021-03 Drop Firebird 2.5 support (for Jaybird 6)

[Mark Rotteveel]

I created jdp-2021-03: Drop Firebird 2.5 support[1], proposed for Jaybird 6.

Feedback can be provided here, or on
https://github.com/FirebirdSQL/jaybird/issues/682

Mark

[1]:
https://github.com/FirebirdSQL/jaybird/blob/master/devdoc/jdp/jdp-2021-03-drop-firebird-2-5-support.md
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Mark Rotteveel