Bump Clojure version to 1.11.0

The latest tooling from CIDER doesn't work with anything earlier than
1.10.3. So we may as well directly upgrade to 1.11.0.

This would only impact the library development itself, as it continues
to be fully compatible with Clojure 1.10.

project.clj

@@ -4,7 +4,7 @@
   :license {:name "Mozilla Public Licence 2.0"
             :url "https://www.mozilla.org/en-US/MPL/2.0/"}
   :min-lein-version "2.9.8"
-  :dependencies [[org.clojure/clojure "1.10.0"]
+  :dependencies [[org.clojure/clojure "1.11.0"]
                  [amazonica "0.3.167" :exclusions [com.amazonaws/aws-java-sdk
                                                    com.amazonaws/amazon-kinesis-client
                                                    com.amazonaws/dynamodb-streams-kinesis-adapter]]