upgrade jackson

[boulter]

Upgrades to avoid CVE mentioned in #1050

[jasmith-hs]

Can you make sure that this logic still works:

jinjava/src/main/java/com/hubspot/jinjava/objects/serialization/PyishObjectMapper.java

Lines 69 to 74 in 89cd768

	if (e instanceof LengthLimitingJsonProcessingException) {
	throw new OutputTooBigException(
	((LengthLimitingJsonProcessingException) e).getMaxSize(),
	((LengthLimitingJsonProcessingException) e).getAttemptedSize()
	);
	}

[jowiho]

In the meantime Jackson 2.15.2 is the latest stable version. I've confirmed that this PR builds and tests correctly with that Jackson version as well.