As of 497da675b9 (committed 1st Sept
2023), `swagger.cljc` uses the `update-vals` function, introduced in
Clojure 1.11.
Due to this, all the example projects fail to run since the
`project.clj` specifies Clojure version 1.10.
This commit updates the Clojure version for such examples, fixing the
problem.
Fixes: #651