deps: bump git2 to 0.16.1 (FuelLabs#4020)

## Description

Closes FuelLabs#4019 
Got a message when pushing that there was a vulnerability with git2
versions below `0.16.1`:

https://github.com/FuelLabs/sway/security/dependabot/19

## Checklist

- [x] I have linked to any relevant issues.
- [ ] I have commented my code, particularly in hard-to-understand
areas.
- [ ] I have updated the documentation where relevant (API docs, the
reference, and the Sway book).
- [ ] I have added tests that prove my fix is effective or that my
feature works.
- [ ] I have added (or requested a maintainer to add) the necessary
`Breaking*` or `New Feature` labels where relevant.
- [ ] I have done my best to ensure that my PR adheres to [the Fuel Labs
Code Review
Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md).
- [ ] I have requested a review from the relevant team or maintainers.

forc-pkg/Cargo.toml

@@ -14,7 +14,7 @@ fd-lock = "3.0"
 forc-tracing = { version = "0.34.0", path = "../forc-tracing" }
 forc-util = { version = "0.34.0", path = "../forc-util" }
 fuel-abi-types = "0.1"
-git2 = { version = "0.14", features = ["vendored-libgit2", "vendored-openssl"] }
+git2 = { version = "0.16.1", features = ["vendored-libgit2", "vendored-openssl"] }
 hex = "0.4.3"
 petgraph = { version = "0.6", features = ["serde-1"] }
 semver = { version = "1.0", features = ["serde"] }