chore(deps): add regex, hex, percent-encoding for v1.1.0 stdlib

Workspace deps for the seven Rhai utility modules that follow in this
PR. `rand`, `base64`, `uuid`, `chrono`, `serde_json` are already in
the workspace and reused as-is — only the genuinely new ones land here.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -1566,8 +1566,13 @@ dependencies = [
 name = "picloud-executor-core"
 version = "0.6.0"
 dependencies = [
+ "base64",
  "chrono",
+ "hex",
+ "percent-encoding",
  "picloud-shared",
+ "rand 0.8.6",
+ "regex",
  "rhai",
  "serde",
  "serde_json",