PlutoTeachingTools: fix missing compat bound (#138978)

Author: fonsp

P/PlutoTeachingTools/Compat.toml

@@ -4,7 +4,7 @@ LaTeXStrings = "1"
 ["0 - 0.2.4"]
 julia = "1"
 
-["0.1.3 - 0.3"]
+["0.1.3 - 0.3.0"]
 PlutoUI = "0.7"
 
 ["0.1.5 - 0"]
@@ -31,6 +31,9 @@ Downloads = ["0.0.0", "1"]
 ["0.3 - 0"]
 Markdown = ["0.0.0", "1"]
 
+["0.3.1 - 0.3.99"]
+PlutoUI = "0.7.56-0.7"
+
 ["0.4 - 0.4.1"]
 Downloads = ["0.0.0", "0.1-0.2", "1"]
 PlutoUI = "0.7.56-0.7"