Upgrade to newest Dokka and Knit (#2805)

* Migrate to Dokka pre-1.5.0

Co-authored-by: Kamil Doległo <kamilok1965@interia.pl>
Co-authored-by: dkhalanskyjb <52952525+dkhalanskyjb@users.noreply.github.com>
diff --git a/gradle.properties b/gradle.properties
index 0c1076e..a6e0177 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -11,10 +11,10 @@
 junit_version=4.12
 junit5_version=5.7.0
 atomicfu_version=0.16.1
-knit_version=0.2.3
+knit_version=0.3.0-RC
 html_version=0.7.2
 lincheck_version=2.14
-dokka_version=0.9.16-rdev-2-mpp-hacks
+dokka_version=1.5.0-dev-106
 byte_buddy_version=1.10.9
 reactor_version=3.4.1
 reactive_streams_version=1.0.3
@@ -53,6 +53,6 @@
 
 # JS IR backend sometimes crashes with out-of-memory
 # TODO: Remove once KT-37187 is fixed
-org.gradle.jvmargs=-Xmx2g
+org.gradle.jvmargs=-Xmx4g
 
 kotlin.mpp.enableCompatibilityMetadataVariant=true