Update jackson-core to 2.12.3

[scala-steward]

Updates com.fasterxml.jackson.core:jackson-core from 2.12.2 to 2.12.3.

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

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention me in the comments below.

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Have a fantastic day writing Scala!

Ignore future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "com.fasterxml.jackson.core", artifactId = "jackson-core" } ]

labels: library-update, semver-patch

[stevedlawrence]

+1, assuming all tests pass once the bintray brown out is over

• Do all automated continuous integration checks pass?
  Yes
• Is the update a patch, minor, or major update?
  Minor release, diff from 2.12.2 shows only a change to a single test file and version bump
• Is the license still compatible with ASF License Policy?
  Yes, same license and no changes to ASF policy
• Have any changes been made to LICENSE/NOTICE files that need to be incorporated?
  No changes
• Have any transitive dependencies been added or changed?
  No changes

[tuxji]

+1