steve-3.4.9

What's new:

• update spring version to address RCE vulnerability (#791)
• update jackson databind to address CVE (FasterXML/jackson-databind#2816)
• migrate from jetty 9 to jetty 10
• mark not connected JSON charge points as disconnected (#355)
• increase hikari's maxLifetime (#736)
• migrate tests from junit 4 to 5
• improve websocket handshake logic
• update dependencies

we urge all users to update to this version.