Add new test for complex checkbox list parsing, update parser to reset checkboxList correctly, and bump version to 1.0.11

src/commonMain/kotlin/nl/astraeus/markdown/parser/Parser.kt

@@ -20,7 +20,7 @@ fun markdown(text: String): List<MarkdownPart> {
 
   var index = 0
   val buffer = StringBuilder()
-  val checkboxList = mutableListOf<CheckboxItem>()
+  var checkboxList = mutableListOf<CheckboxItem>()
 
   fun parseBuffer() {
     if (buffer.isNotBlank()) {
@@ -59,7 +59,7 @@ fun markdown(text: String): List<MarkdownPart> {
             addCheckbox(checkboxList, checkboxLine, buffer)
           }
           parts.add(MarkdownPart.CheckboxList(checkboxList))
-          checkboxList.clear()
+          checkboxList = mutableListOf()
           parseBuffer()
           continue
         } else if (line.startsWith("- [ ]") || line.startsWith("- [x]")) {