gnu: go-github-com-prometheus-common-expfmt: Update to 0.4.1.

* gnu/packages/syncthing.scm (go-github-com-prometheus-common-expfmt):
Update to 0.4.1.

gnu/packages/syncthing.scm

@@ -924,20 +924,18 @@ message streaming.")
       (license asl2.0))))
 
 (define-public go-github-com-prometheus-common-expfmt
-  (let ((commit "2e54d0b93cba2fd133edc32211dcc32c06ef72ca")
-        (revision "0"))
     (package
       (name "go-github-com-prometheus-common-expfmt")
-      (version (git-version "0.0.0" revision commit))
+      (version "0.4.1")
       (source (origin
                 (method git-fetch)
                 (uri (git-reference
                        (url "https://github.com/prometheus/common.git")
-                       (commit commit)))
+                       (commit (string-append "v" version))))
                 (file-name (git-file-name name version))
                 (sha256
                  (base32
-                  "14kn5w7imcxxlfdqxl21fsnlf1ms7200g3ldy29hwamldv8qlm7j"))))
+                  "0sf4sjdckblz1hqdfvripk3zyp8xq89w7q75kbsyg4c078af896s"))))
       (build-system go-build-system)
       (arguments
        '(#:import-path "github.com/prometheus/common/expfmt"
@@ -971,7 +969,7 @@ message streaming.")
       (description "This package provides tools for reading and writing
 Prometheus metrics.")
       (home-page "https://github.com/prometheus/common")
-      (license asl2.0))))
+      (license asl2.0)))
 
 (define-public go-github-com-prometheus-common-model
     (package