build: re-enable go-billy Renovate minor/patch updates on releases/v5.x

[Copilot]

releases/v5.x had a broad Renovate rule disabling non-security dependency bumps, and the existing go-billy allow rule was not explicitly scoped to that branch. As a result, github.com/go-git/go-billy minor/patch updates continued on main but were not allowed through on the v5 release line.

• Scope

  • Update only .renovaterc.json5
  • Preserve the existing non-security bump freeze for all other dependencies on releases/v5.x

• Change

  • Extend the existing github.com/go-git/go-billy allow rule to explicitly match both main and releases/v5.x
  • Keep the rule limited to minor and patch updates

• Effect

  • go-billy minor/patch updates are explicitly allowed on releases/v5.x
  • No change to main
  • No broadened update surface for other packages on the v5 release line

{
  "description": "Enable minor and patch updates for go-billy",
  "matchBaseBranches": ["main", "releases/v5.x"],
  "matchPackageNames": ["github.com/go-git/go-billy"],
  "matchUpdateTypes": ["minor", "patch"],
  "enabled": true
}