Removed circular import in the errors package

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

.changeset/honest-spoons-design.md

@@ -0,0 +1,5 @@
+---
+'@backstage/errors': patch
+---
+
+Removed a circular import

packages/errors/src/errors/CustomErrorBase.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { stringifyError } from '../serialization';
+import { stringifyError } from '../serialization/error';
 import { isError } from './assertion';
 
 /**

packages/errors/src/errors/ResponseError.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { deserializeError } from '../serialization';
+import { deserializeError } from '../serialization/error';
 import {
   ErrorResponseBody,
   parseErrorResponseBody,

packages/errors/src/serialization/error.ts

@@ -19,7 +19,7 @@ import {
   deserializeError as deserializeErrorInternal,
   serializeError as serializeErrorInternal,
 } from 'serialize-error';
-import { isError } from '../errors';
+import { isError } from '../errors/assertion';
 
 /**
  * The serialized form of an Error.