Update joda-time to 2.12.4

[47erbot]

Updates joda-time:joda-time from 2.12.3 to 2.12.4. GitHub Release Notes - Version Diff

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

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Adjust future updates

Add this to your `.scala-steward.conf` file to ignore future updates of this dependency: ``` updates.ignore = [ { groupId = "joda-time", artifactId = "joda-time" } ] ``` Or, add this to slow down future updates of this dependency: ``` dependencyOverrides = [{ pullRequests = { frequency = "30 days" }, dependency = { groupId = "joda-time", artifactId = "joda-time" } }] ```

labels: library-update, early-semver-patch, semver-spec-patch, commit-count:1