Update Kotlin to 1.9.10, and related Maven packages.

Add .editorconfig to suppress some annoying ktlint checks.

.editorconfig

@@ -0,0 +1,15 @@
+[*.{kt,kts}]    
+max_line_length = 120
+
+# Comma-separated list of rules to disable (Since 0.34.0)   
+# Note that rules in any ruleset other than the standard ruleset will need to be prefixed   
+# by the ruleset identifier.    
+
+# I find trailing commas annoying
+ktlint_standard_trailing-comma-on-call-site = disabled
+ktlint_standard_trailing-comma-on-declaration-site = disabled
+
+[pom.xml]
+indent_style = space
+indent_size = 4
+max_line_length = 120

pom.xml

@@ -8,9 +8,9 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <smack.version>4.4.6</smack.version>
-    <junit.version>5.8.2</junit.version>
-    <kotlin.version>1.6.21</kotlin.version>
-    <kotest.version>5.3.0</kotest.version>
+    <junit.version>5.10.0</junit.version>
+    <kotlin.version>1.9.10</kotlin.version>
+    <kotest.version>5.7.2</kotest.version>
   </properties>
   <name>jitsi-xmpp-extensions</name>
   <url>https://github.com/jitsi/jitsi-xmpp-extensions</url>