Set body-max-line-length to Infinity

[michelegera]

Since Dependabot commit messages body line lengths do not conform with commitlint’s current limit of 100 characters, we are modifying the rule to accept an infinite number of characters.

The reasons behind this:

• Relying on the commit body from a third party is fragile; if Dependabot updates its wording, we have to update the override
• Bumping to a fixed char limit is also not the best, could fail sometimes, we would be stuck (re-)bumping the limit every time
• Commit body is actually not used in the changelog generation, so it won’t change much in the end