Excavator: Upgrades Baseline to the latest version

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[schlosna]

@pkoenig10 this seems like a false positive failing on the ImmutablesStyle error-prone check added in palantir/gradle-baseline#1727 on annotations that are not @Value.Style meta annotations:

> Task :tritium-metrics:compileJava FAILED
/home/circleci/project/tritium-metrics/src/main/java/com/palantir/tritium/event/metrics/annotations/MetricGroup.java:30: warning: [ImmutablesStyle] Using an inline Immutables @Value.Style annotation or meta-annotation with non-SOURCE rentention forces consumers to add a Immutables annotations to their compile classpath.Instead use a meta-annotation with SOURCE retention.See https://github.com/immutables/immutables/issues/291.
public @interface MetricGroup {
        ^
    (see https://github.com/palantir/gradle-baseline#baseline-error-prone-checks)
error: warnings found and -Werror specified
1 error
1 warning

tritium/tritium-metrics/src/main/java/com/palantir/tritium/event/metrics/annotations/MetricGroup.java

Lines 28 to 30 in 37dc511

	@Target({ElementType.METHOD, ElementType.TYPE})
	@Retention(RetentionPolicy.RUNTIME)
	public @interface MetricGroup {

and also failing at:

tritium/tritium-lib/src/main/java/com/palantir/tritium/proxy/ByteBuddyInstrumentationAdvice.java

Lines 40 to 42 in 37dc511

	@Retention(RetentionPolicy.RUNTIME)
	@Target(ElementType.PARAMETER)
	@interface MethodIndex {}

[schlosna]

Fixed by palantir/gradle-baseline#1781