Bug#1074774: Upgrading bctoolbox to 5.3.x

[Andrea Pappacoda]

Hi Bernhard, writing to you directly since sometimes the BTS discards 
emails.

Could you please let me know if you have plans for upgrading bctoolbox 
to a new upstream version from the 5.3 branch? It's needed to continue 
with the mbedtls 3.6 transition.

If not, would it be ok if I work on the update myself and then push an 
NMU?

Let me know! Bye :)