gnu: Remove go-github-com-matrix-org-gomatrix.

Not in use by any packages in Guix, project is archived upstream and not
maintained: "This repository has been archived by the owner on Feb 21,
2024. It is now read-only.".

* gnu/packages/golang.scm (go-github-com-matrix-org-gomatrix): Delete variable.

Change-Id: I98b6de96f87d8869bb2485a49f7269435062ab38

gnu/packages/golang.scm

@@ -2613,27 +2613,6 @@ translation (NAT), proxies, sockets, and transport layer security (TLS).")
 machine friendly values.")
     (license license:asl2.0)))
 
-(define-public go-github-com-matrix-org-gomatrix
-  (package
-    (name "go-github-com-matrix-org-gomatrix")
-    (version "0.0.0-20220926102614-ceba4d9f7530")
-    (source (origin
-              (method git-fetch)
-              (uri (git-reference
-                    (url "https://github.com/matrix-org/gomatrix")
-                    (commit (go-version->git-ref version))))
-              (file-name (git-file-name name version))
-              (sha256
-               (base32
-                "0vq29bdswvffxsmwvi20wnk73xk92dva0fdr2k3zshr4z10ypm2x"))))
-    (build-system go-build-system)
-    (arguments
-     (list #:import-path "github.com/matrix-org/gomatrix"))
-    (home-page "https://github.com/matrix-org/gomatrix")
-    (synopsis "Golang Matrix client")
-    (description "This package provides a Golang Matrix client.")
-    (license license:asl2.0)))
-
 (define-public go-github-com-aarzilli-golua
   (let ((commit "03fc4642d792b1f2bc5e7343b403cf490f8c501d")
         (revision "0"))