Bump org.plumelib:options from 1.0.6 to 2.0.3

Bumps [org.plumelib:options](https://github.com/plume-lib/options) from 1.0.6 to 2.0.3.
- [Release notes](https://github.com/plume-lib/options/releases)
- [Changelog](https://github.com/plume-lib/options/blob/master/CHANGELOG.md)
- [Commits](plume-lib/options@v1.0.6...v2.0.3)

---
updated-dependencies:
- dependency-name: org.plumelib:options
  dependency-version: 2.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

checker/build.gradle

@@ -93,7 +93,7 @@ dependencies {
 
     // Required for checker/tests/index-initializedfields/RequireJavadoc.java
     if (isJava8) {
-        testImplementation 'org.plumelib:options:1.0.6'
+        testImplementation 'org.plumelib:options:2.0.3'
     } else {
         testImplementation 'org.plumelib:options:2.0.3'
     }