Update dependency pytest-cov to v7

Author: elastic-renovate-prod[bot]

requirements.txt

@@ -9,7 +9,7 @@ types-protobuf==5.28.3.20241203
 # dev
 ruff==0.14.3
 pytest==8.4.2
-pytest-cov==6.3.0
+pytest-cov==7.0.0
 pytest-asyncio==1.2.0
 pytest-mock==3.15.1
 pytest-randomly==3.16.0