Fix: admin client (#13699)

### What problem does this PR solve?

Define a crypt function in admin directory, remove import from
api.utils. And move requests-toolbelt to dependency.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

admin/client/pyproject.toml

@@ -11,13 +11,13 @@ dependencies = [
     "beartype>=0.20.0,<1.0.0",
     "pycryptodomex>=3.10.0",
     "lark>=1.1.0",
+    "requests-toolbelt>=1.0.0",
 ]
 
 [dependency-groups]
 test = [
     "pytest>=8.3.5",
     "requests>=2.32.3",
-    "requests-toolbelt>=1.0.0",
 ]
 
 [tool.setuptools]