Add Java 17 and 19, drop Java 16.

Finding issues with Java 16 that aren't in 17 or 15 seems unlikely, plus
users really should have either upgraded to the latest interim release
(19) or the next LTS (17), as 16 is no longer supported. (15 has limited
support.)

Author: alysbrooks

.circleci/config.yml

@@ -43,5 +43,5 @@ workflows:
       - test:
           matrix:
             parameters:
-              os: [clojure/openjdk16, clojure/openjdk15, clojure/openjdk11, clojure/openjdk8]
+              os: [clojure/openjdk19, clojure/openjdk17, clojure/openjdk15, clojure/openjdk11, clojure/openjdk8]
               clojure_version: ["1.10.3", "1.11.1"]