Maven JavaDocs

API changes

• Add onDropped callback for onBackpressureLatest. (#7542)
• Add onDropped callback to onBackpressureBuffer. (#7567)

Documentation

• Change summary to caption, because summary is obsolete in HTML5. (#7534)
• Try using https to access the reactive streams javadoc. (#7535)
• Improve Javadoc of Disposable.

Other

• Add minimum GitHub token permissions for workflows. (#7541)
• Create SECURITY.md (#7546)
• Add copyright and license to jar. (#7520)
• Convert CompletableOnErrorComplete$onError inner class to static. (#7575)
• Allow null accumulator type in the collect(Collector) operators. (#7590)