Update requirements.txt

Author: daisieh

requirements.txt

@@ -18,3 +18,4 @@ werkzeug>=3.1.0 # not directly required, pinned by Snyk to avoid a vulnerability
 zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability
 urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability
 requests==2.32.4
+requests-mock>=1.12.1