Add Renovate tracking for CRS v4 LTS (4.25.x) with zero release age

[Copilot]

This updates Renovate to manage lts_v4_version in config/_default/params.yaml against the CRS v4 LTS line (4.25.x). It also removes release-age delay for that LTS stream by setting minimum age to zero.

• LTS dependency lane

  • Added a dedicated package rule for coreruleset-v4-lts.
  • Constrained updates to >=4.25.0 <4.26.0.
  • Set minimumReleaseAge to 0 days.

• Custom manager for lts_v4_version

  • Added a regex-based custom manager entry targeting:
    • config/_default/params.yaml
    • lts_v4_version: "<semver>"

{
  "matchDepNames": ["coreruleset-v4-lts"],
  "allowedVersions": ">=4.25.0 <4.26.0",
  "minimumReleaseAge": "0 days",
  "groupName": "CRS v4 LTS updates"
}