fix: replace at_commons dependency overrides with published version

packages/at_secondary_server/pubspec.yaml

@@ -19,7 +19,7 @@ dependencies:
   basic_utils: 5.7.0
   ecdsa: 0.1.0
   encrypt: 5.0.3
-  at_commons: 5.1.0
+  at_commons: 5.1.1
   at_utils: 3.0.19
   at_chops: 2.2.0
   at_lookup: 3.0.49
@@ -34,13 +34,6 @@ dependencies:
   yaml: 3.1.2
   logging: 1.2.0
 
-dependency_overrides:
-  at_commons:
-    git:
-      url: https://github.com/atsign-foundation/at_libraries.git
-      path: packages/at_commons
-      ref: apkam_iv_issue_fix
-
 dev_dependencies:
   build_runner: ^2.3.3
   test: ^1.25.9