Merge pull request #856 from NHSDigital/DTOSS-11940-gitleaks-leaked-secret

[DTOSS-11940] chore: Add Gitleaks ignore entry for false positive generic-api-key detection

Author: josielsouzanordcloud

.gitleaksignore

@@ -25,3 +25,4 @@ manage_breast_screening/config/settings_test.py:private-key:34
 manage_breast_screening/config/settings_test.py:public-key:61
 manage_breast_screening/config/.env.tpl:generic-api-key:36
 manage_breast_screening/config/.env.tpl:generic-api-key:42
+manage_breast_screening/notifications/management/commands/README_MESH_POLLING.md:generic-api-key:207