fix(deny): use allow-org for git source allowlist

cargo-deny's allow-git requires exact URLs, not org prefixes.
Switch to [sources.allow-org] which properly allows all repos
under the oxidized-mc GitHub organization.

Author: dodoflix

deny.toml

@@ -32,4 +32,6 @@ wildcards         = "allow"
 unknown-registry = "deny"
 unknown-git      = "deny"
 allow-registry   = ["https://github.com/rust-lang/crates.io-index"]
-allow-git        = ["https://github.com/oxidized-mc"]
+
+[sources.allow-org]
+github = ["oxidized-mc"]