Lexicon v3.12.0

Added

• Add duckdns provider (experimental support) (#1533)
• Add dnsservices provider (#1603)
• Add flexibleengine provider (#1600)
• Official support for Python 3.11

Modified

• Upgrade API version used for azure provider (#1606)
• Various fixes for documentation (#1488 #1458 #1601 #1605)
• Fix check for extra dependencies (#1568)