Update git2 requirement from 0.14.* to 0.17.*

[dependabot[bot]]

Updates the requirements on git2 to permit the latest version.

Changelog

Sourced from git2's changelog.

0.17.1 - 2023-04-13

0.17.0...0.17.1

Changed

• Updated to libgit2 1.6.4. #948

0.17.0 - 2023-04-02

0.16.1...0.17.0

Added

• Added IntoIterator implementation for Statuses. #880
• Added Reference::symbolic_set_target #893
• Added Copy, Clone, Debug, PartialEq, and Eq implementations for AutotagOption and FetchPrune. #889
• Added Eq and PartialEq implementations for Signature. #890
• Added Repository::discover_path. #883
• Added Submodule::repo_init. #914
• Added Tag::is_valid_name. #882
• Added Repository::set_head_bytes. #931
• Added the Indexer type which is a low-level API for storing and indexing pack files. #911
• Added Index::find_prefix. #903
• Added support for the deprecated group-writeable blob mode. This adds a new variant to FileMode. #887
• Added PushCallbacks::push_negotiation callback and the corresponding PushUpdate type for getting receiving information about the updates to perform. #926

Changed

• Updated to libgit2 1.6.3. This brings in many changes, including better SSH host key support on Windows and better SSH host key algorithm negotiation. 1.6.3 is now the minimum supported version. #935
• Updated libssh2-sys from 0.2 to 0.3. This brings in numerous changes, including SHA2 algorithm support with RSA. #919
• Changed RemoteCallbacks::credentials callback error handler to correctly set the libgit2 error class. #918
• DiffOptions::flag now takes a git_diff_option_t type.

... (truncated)

Commits

• 88c67f7 Merge pull request #948 from edrevo/edrevo/libgit2-1.6.4
• 8656d0e Update 1.6.4 changelog entry.
• 55d0e67 Add links to this PR in changelog
• 3bd681c Bump libgit2 to 1.6.4
• c6a3ddc Merge pull request #947 from ehuss/readme-libgit2-version
• 16e5696 Update reference to libgit2 version in README.
• 7164c24 Merge pull request #944 from ehuss/update-changelog
• e586a7d Update changelogs
• 88a9817 Merge pull request #926 from karin0/push_negotiation
• a638e23 add a test for push_negotiation
• Additional commits viewable in compare view

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