Excavator: Upgrades Baseline to the latest version

[svc-excavator-bot]

excavator is a bot for automating changes across repositories.

Changes produced by the roomba/latest-baseline-oss check.

Release Notes

1.18.0

Type	Description	Link
Improvement	When computing unused dependencies, compileOnly and annotationProcessor dependencies are ignored due to false positives as these dependencies will not appear as dependencies in the generated byte-code, but are in fact necessary dependencies to compile a given module.	palantir/gradle-baseline#783

1.19.0

Type	Description	Link
Improvement	Disable PreconditionsConstantMessage on gradle plugins	palantir/gradle-baseline#790

2.0.0

Type	Description	Link
Break	Add gradle 6.0-20190904072820+0000 compatibiltiy. This raises minimum required version of gradle for plugins from this repo to 5.0. Additionally add '-Werror' and '-Xlint:deprecation' so we can detect compatiblilty issues early	palantir/gradle-baseline#791

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