GitUp: Cherry-pick of 3847522

Merge pull request libgit2#6303 from zawata/legacy_buffer_stream_segfault

filter: Fix Segfault

Resolve test failures from API changes

Pass current remote to git_push_negotiation callback

This makes it quite easier to implement the Git 'pre-push' hook.

CHANGELOG: document git_filter_init and GIT_FILTER_INIT

CHANGELOG: document git_filter_init and GIT_FILTER_INIT

Merge pull request libgit2#4262 from libgit2/ethomson/bump-v26

Update version number to 0.26

Merge pull request libgit2#4076 from libgit2/cmn/sec-update-25

security updates for v0.25

Merge pull request libgit2#4075 from libgit2/cmn/sec-update-24

Security updates for v0.24

Pass current remote to git_push_negotiation callback

This makes it quite easier to implement the Git 'pre-push' hook.

Pass current remote to git_push_negotiation callback

This makes it quite easier to implement the Git 'pre-push' hook.