v1.6.2: update changelog

v1.6.1: correct missing version number updates

Merge pull request libgit2#6477 from libgit2/ethomson/v1.5.2

v1.5.2

Merge pull request libgit2#6478 from libgit2/ethomson/v1.4.6

v1.4.6

Merge pull request libgit2#6450 from libgit2/1.5_ssh

ssh: perform host key checking by default

Merge pull request libgit2#6449 from libgit2/1.4_ssh

ssh: perform host key checking by default

Merge pull request libgit2#6351 from libgit2/ethomson/v1.5.0

v1.5.0

meta: add changelog for v1.4.4

meta: update changelog for v1.3.2

Merge pull request libgit2#6270 from libgit2/ethomson/v1.4.3

v1.4.3 release