test: add respx mock route for /repositories endpoint (#75)

Fixes #73

Author: afuetterer

.pre-commit-config.yaml

@@ -14,7 +14,6 @@ ci:
 exclude: |
   (?x)^(
       tests/cassettes/repository.yaml|
-      tests/cassettes/repositories.yaml|
       CHANGELOG.md
   )$
 
@@ -80,6 +79,7 @@ repos:
     additional_dependencies:
     - httpx>=0.27
     - pytest>=8.2
+    - respx>=0.21
     - typer>=0.12
 
 - repo: https://github.com/scientific-python/cookie