Allow unused workspace dependencies due to cargo-deny mirror issue

Temporarily allow unused workspace dependencies in cargo deny config
to work around a known issue (cargo-deny#694) where the unused check
fails when using registry mirrors or vendor directories.

The issue causes false positives in the unused workspace dependency
check when crates.io is replaced with a mirror or vendored
dependencies. This change allows builds to proceed while maintaining
other cargo deny checks.

Reference: EmbarkStudios/cargo-deny#694

Author: qianxjcraig

Diff for: sources/deny.toml

@@ -71,7 +71,7 @@ skip-tree = [
 [bans.workspace-dependencies]
 duplicates = "deny"
 include-path-dependencies = true
-unused = "deny"
+unused = "allow"
 
 [advisories]
 # generational-arena is currently unmaintained.