bump basepom to 63, add required pom metadata fields

[jaredstehler]

Also fixes new findbugs errors:

[ERROR] Medium: The method 'addKeyToken(Scanner$Token)' in class 'ExtendedScanner' hides a method in class 'Scanner'. Declare the respective methods non-static or private to eradicate the problem. [com.hubspot.jinjava.el.ext.ExtendedScanner] At ExtendedScanner.java:[line 63] HSM_HIDING_METHOD
[ERROR] Medium: Suppressing annotation on the method com.hubspot.jinjava.interpret.JinjavaInterpreter.resolveBlockStubs(OutputList, Stack) is unnecessary [com.hubspot.jinjava.interpret.JinjavaInterpreter] At JinjavaInterpreter.java:[lines 534-597] US_USELESS_SUPPRESSION_ON_METHOD
[ERROR] Medium: Suppressing annotation on the method com.hubspot.jinjava.lib.filter.AbstractFilter.filter(Object, JinjavaInterpreter, Object[], Map) is unnecessary [com.hubspot.jinjava.lib.filter.AbstractFilter] At AbstractFilter.java:[lines 83-126] US_USELESS_SUPPRESSION_ON_METHOD
[ERROR] Medium: Shared primitive variable "reconstructing" in one thread may not yield the value of the most recent write from another thread [com.hubspot.jinjava.lib.fn.eager.EagerMacroFunction, com.hubspot.jinjava.lib.fn.eager.EagerMacroFunction] At EagerMacroFunction.java:[line 269]Another occurrence at EagerMacroFunction.java:[line 287] AT_STALE_THREAD_WRITE_OF_PRIMITIVE
[ERROR] Medium: The method 'instance()' in class 'NonRevertingEagerExecutionMode' hides a method in class 'EagerExecutionMode'. Declare the respective methods non-static or private to eradicate the problem. [com.hubspot.jinjava.mode.NonRevertingEagerExecutionMode] At NonRevertingEagerExecutionMode.java:[line 10] HSM_HIDING_METHOD

[jaredstehler]

Moving to basepom 63 is now required for future release publishing.