Reconnection Backoff Fix

What's Changed

• Mqtt311 to mqtt5 builder by @TwistedTwigleg in #368
• Add Greengrass IPC sample to Java SDK by @TwistedTwigleg in #372
• fix: exec main plugin mainClass typo by @xiazhvera in #374
• Add Cognito connect sample by @TwistedTwigleg in #376
• Update Fleet Provisioning sample by @TwistedTwigleg in #377
• Break samples README into per-sample READMEs by @TwistedTwigleg in #378
• Fix MQTT5 PubSub link by @TwistedTwigleg in #381
• CI and documentation generation adjustment by @TwistedTwigleg in #383
• Mqtt5 shared subscription sample by @TwistedTwigleg in #387
• Shared subscription readme adjustment by @TwistedTwigleg in #391
• Update crt to 0.21.10 by @xiazhvera in #390
• AutoTag PR for v1.11.6 by @TwistedTwigleg in #393

Full Changelog: v1.11.5...v1.11.6