Update dependency prism to v1.9.0

Author: renovate[bot]

Gemfile.lock

@@ -446,7 +446,7 @@ GEM
       syntax_tree-rbs (>= 0.2.0)
     prettier_print (1.2.1)
     prettyprint (0.2.0)
-    prism (1.6.0)
+    prism (1.9.0)
     pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)