Bump git2 from 0.19.0 to 0.20.0 #1672

Job	Run time
Build the CLI binary (x86_64-unknown-linux-gnu, ubuntu-22.04)	10m 21s
Build the CLI binary (aarch64-apple-darwin, macos-15)	10m 50s
Build the CLI binary (x86_64-pc-windows-msvc, windows-latest, .exe, --no-default-features -F exte...	18m 9s
Build the CLI binary (aarch64-unknown-linux-gnu, self-hosted, linux, arm64)	5m 34s
Generate shell completion files	6m 23s
Build the CLI binary (x86_64-apple-darwin, macos-15)	10m 57s
Build the release artifacts	42s
Create release from tag	0s
	1h 2m 56s

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