security/putty: update to 0.83

Quoting https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html,
omitting three Windows items:

These features are new in [PuTTY] 0.83 (released 2025-02-08):

+ Support for ML-KEM, the NIST-standardised post-quantum key exchange

mechanism. (In addition to NTRU Prime, which has been supported since 0.78.)

+ [...]
+ Bug fix: psftp -b works again.
+ Bug fix: assertion failure if an SSH connection times out at the login

prompt.

+ Bug fix: crash in Pageant if an SSH connection is abandoned while waiting

for a deferred decryption passphrase.

+ Bug fix: tight loop if PuTTY tried to send an empty answerback string.
+ Bug fix: accidental truncation of some configuration edit boxes' contents to

127 characters.

+ [...]
+ Bug fix: restored interoperation with third-party tools that auto-fill login

prompts by sending ^M for Return.

+ [...]
+ Bug fix: the small keypad keys didn't reliably work in the terminal on Unix.

MFH: 2025Q1
(cherry picked from commit b2bb9b70e940e17374aea95006d0ea82ace3c31a)
(cherry picked from commit 5fcc3cf50f8dc8131f2181c481eaac755eff9346)
(cherry picked from commit df77b7d2cd11a73414d524fe35919bf1dd206631)
(cherry picked from commit b3047ff6339ae353e1ccf480dee6968e1c0bfaa1)
(cherry picked from commit e7afbce7472c2f071ca94ae856b246b9a6667d76)
(cherry-picks committed in one lump via git-cherry-pick -xn ...)