Bug fixes and updates

What's Changed

• add note about keep alive and relation to ping timeout by @sbSteveK in #549
• WebSocket Connection methods by @alfred2g in #545
• prioritize mqtt5 samples by @sbSteveK in #553
• Fix variable names in docs by @sfod in #554
• Disable Windows certificate CI job by @sfod in #558
• Minor GitHub workflow changes by @jmklix in #559
• add windows cert snippet to userguide by @alfred2g in #557
• Fix windows certificate store test by @xiazhvera in #560
• Use aws-actions/configure-aws-credentials@v2 by @sfod in #562
• Migrate your code from V1 to V2 Sdk by @alfred2g in #556
• update crt by @sbSteveK in #564
• AutoTag PR for v1.21.1 by @bretambrose in #565

Full Changelog: v1.21.0...v1.21.1