gnu: emacs-package-lint: Update to 0.15.

* gnu/packages/emacs-xyz.scm (emacs-package-lint): Update to 0.15.

gnu/packages/emacs-xyz.scm

@@ -20063,24 +20063,19 @@ image, rotate it, save modified images, and more.")
       (license license:gpl3+))))
 
 (define-public emacs-package-lint
-  ;; The commit below includes a fix for a missing file, "stdlib-changes",
-  ;; preventing build.
-  (let ((commit "14c216f4889e71eec2a9da64e36ab8990337e82d")
-        (version "0.13")
-        (revision "0"))
   (package
     (name "emacs-package-lint")
-      (version (git-version version revision commit))
+    (version "0.15")
     (source
      (origin
        (method git-fetch)
        (uri (git-reference
              (url "https://github.com/purcell/package-lint")
-               (commit commit)))
+             (commit version)))
        (file-name (git-file-name name version))
        (sha256
         (base32
-           "1zifiqmpj9j14fnrm3jxapady25m1nlm514nfry0jfrhhikvj6i8"))))
+         "1cn713g90zyjfq225yvg14c1qshslpi4466m3w102l5g57p8xv44"))))
     (arguments
      '(#:include (cons "^data/" %default-include)))
     (build-system emacs-build-system)
@@ -20092,7 +20087,7 @@ e.g. the package dependencies it requires.  See function
 @code{package-lint-buffer}.  Checks will currently be enabled only if a
 \"Package-Requires:\" or \"Package-Version:\" header is present in the
 file.")
-      (license license:gpl3+))))
+    (license license:gpl3+)))
 
 (define-public emacs-picpocket
   (let ((version "41")