fix: downgrade flexmark to 0.62.2

0.64.0 requires Java 11, so we can't move that high

Author: ckipp01

project/Dependencies.scala

@@ -10,10 +10,12 @@ object Dependencies {
   val `jackson-dataformat-yaml` =
     "com.fasterxml.jackson.dataformat" % "jackson-dataformat-yaml" % jacksonVersion
 
-  private val flexmarkVersion = "0.64.0"
+  // Freeze on 0.62.x as 0.64.0 requires Java 11
+  private val flexmarkVersion = "0.62.2"
 
   val flexmarkDeps = Seq(
     "com.vladsch.flexmark" % "flexmark" % flexmarkVersion,
+    "com.vladsch.flexmark" % "flexmark-util-ast" % flexmarkVersion,
     "com.vladsch.flexmark" % "flexmark-util-html" % flexmarkVersion,
     "com.vladsch.flexmark" % "flexmark-ext-anchorlink" % flexmarkVersion,
     "com.vladsch.flexmark" % "flexmark-ext-autolink" % flexmarkVersion,