Bump nippy to 3.1.1 w/ fix for breaking change

Versions after 2.14.0 required a breaking change due to security
advisories (see taoensso/nippy#130). The
fix requires explicit declaration of the types that are safe to
thaw.

project.clj

@@ -13,7 +13,7 @@
                  [org.apache.beam/beam-runners-google-cloud-dataflow-java "2.26.0"]
                  [org.apache.beam/beam-runners-core-java "2.26.0"]
                  [org.apache.kafka/kafka-clients "2.5.0"]
-                 [com.taoensso/nippy "2.14.0"]
+                 [com.taoensso/nippy "3.1.1"]
                  [org.clojure/math.combinatorics "0.1.6"]
                  [org.clojure/tools.logging "1.1.0"]
                  [clj-time "0.15.2"]

src/clj/datasplash/core.clj

@@ -398,6 +398,10 @@ See https://cloud.google.com/dataflow/java-sdk/JavaDoc/com/google/cloud/dataflow
   [^DoFn$ProcessContext c]
   (.output c (.element c)))
 
+(alter-var-root #'nippy/*thaw-serializable-allowlist*
+                (fn [_] (into nippy/default-thaw-serializable-allowlist
+                             #{"org.apache.beam.sdk.values.KV"})))
+
 (defn make-nippy-coder
   {:doc "Returns an instance of a CustomCoder using nippy for serialization"
    :added "0.1.0"}