gnu: java-pep-adapter: Update to 2.1.

* gnu/packages/pep.scm(java-pep-adapter): Update to 2.1. [source]: Change to
  git repo.

pEp/nightly.scm

@@ -263,16 +263,16 @@ adapters.")
 (define-public java-pep-jni-adapter
   (package
     (name "java-pep-jni-adapter")
-    (version "2.1.0")
+    (version "2.1")
     (source
      (origin
-       (method hg-fetch)
-       (uri (hg-reference
-             (url "https://pep.foundation/dev/repos/pEpJNIAdapter")
-             (changeset "677676fc1fff"))) ;; changeset 970
-       (file-name (string-append name "-" version "-checkout"))
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://gitea.pep.foundation/pEp.foundation/pEpJNIAdapter")
+             (commit (string-append "Release_" version))))
+       (file-name (git-file-name name version))
        (sha256
-        (base32 "0i5l0gf5f15vrw34lp8wrkdrc8vcw14livr6430b8xmiang9l15v"))))
+        (base32 "1v56lj305b5mh45l5jz4gmkjlq488si7ndnp2lp9h3zsdlla1rjk"))))
     (build-system gnu-build-system)
     (outputs '("out" "doc"))
     (arguments