build(pkgbuild): update license and remove git dependency

The package license has been updated from GPL3 to MIT.
The explicit 'git' dependency was removed from the PKGBUILD and SRCINFO.

.SRCINFO

@@ -5,9 +5,8 @@ pkgbase = opencode
 	url = https://github.com/tfkhdyt/geminicommit
 	arch = x86_64
 	arch = aarch64
-	license = GPL3
+	license = MIT
 	makedepends = go
-	depends = git
 	source = https://github.com/opencode-ai/opencode/archive/refs/tags/v0.0.53.tar.gz
 	sha256sums = 53e23c62284a50c38fd664de441b6db540fa5c944358fffd319f548ee504cb84