fix(auth-token): reduce token fetch window (#1805)

- reduce token fetch window from 2 hours to 5 minutes
- add changeset to release changes

Author: ajimae

.changeset/healthy-donuts-grow.md

@@ -0,0 +1,5 @@
+---
+'@commercetools/sdk-middleware-auth': patch
+---
+
+Change token fetch window from 2 hours to 5 minutes.

packages/sdk-middleware-auth/src/base-auth-flow.js

@@ -29,8 +29,8 @@ function calculateExpirationTime(expiresIn: number): number {
   return (
     Date.now() +
     expiresIn * 1000 -
-    // Add a gap of 2 hours before expiration time.
-    2 * 60 * 60 * 1000
+    // Add a gap of 5 minutes before expiration time.
+    5 * 60 * 1000
   )
 }