Co-authored-by: Rhys Arkins <rhys@arkins.net>

Previously Renovate checked for xmlns="http://maven.apache.org/POM/4.0.0" and if not found then did not attempt to parse the file. Instead, now it checks for `<modelVersion>4.0.0</modelVersion>` as an alternative. Reference: https://maven.apache.org/guides/introduction/introduction-to-the-pom.html

Closes #5160

This reverts commit a6fc0d69.

This allows for comments in the image: line to be replaced

Co-authored-by: Rhys Arkins <rhys@arkins.net>

This reverts commit ff0ffd2e.

Closes #5121

Fixes #5050