Update java-pep-jni-adapter to 2.1.0.

pEp/nightly.scm

@@ -389,13 +389,13 @@ adapters.")
 (define-public java-pep-jni-adapter
   (package
     (name "java-pep-jni-adapter")
-    (version "2.1.0-rc12")
+    (version "2.1.0")
     (source
      (origin
        (method hg-fetch)
        (uri (hg-reference
              (url "https://pep.foundation/dev/repos/pEpJNIAdapter")
-             (changeset "5d4ad9577e68"))) ;; r924
+             (changeset "677676fc1fff"))) ;; changeset 970
        (file-name (string-append name "-" version "-checkout"))
        (sha256
         (base32 "0i5l0gf5f15vrw34lp8wrkdrc8vcw14livr6430b8xmiang9l15v"))))