Upgrade Prism to v1.3.0 (#3004)

### Motivation

Upgrade to the latest version of Prism and our gem RBIs. There are no breaking changes that impact the LSP, so we don't need to bump our dependency constraints.

Author: vinistock

Gemfile.lock

@@ -39,7 +39,7 @@ GEM
       ast (~> 2.4.1)
       racc
     prettier_print (1.2.1)
-    prism (1.2.0)
+    prism (1.3.0)
     psych (5.1.2)
       stringio
     racc (1.8.1)