Update .tool-versions with Ruby 3.3.7

This is in preparation for updating the GDK to use Ruby 3.3.7.
Note that Ruby 3.2.4 is still the default.

.tool-versions

@@ -3,7 +3,7 @@ minio 2022-07-15T03-44-22Z
 nodejs 20.12.2
 postgres 14.9 13.12
 redis 7.0.14
-ruby 3.2.4 3.2.5
+ruby 3.2.4 3.3.7
 rust 1.73.0
 yarn 1.22.19
 vale 3.9.3