gnu: Remove rust-tracing-fmt-0.1.

* gnu/packages/crates-io.scm (rust-tracing-fmt-0.1): Delete variable.

gnu/packages/crates-io.scm

@@ -64424,32 +64424,6 @@ automatically instrumenting functions.")
 @code{futures} with @code{tracing}.")
     (license license:expat)))
 
-(define-public rust-tracing-fmt-0.1
-  (package
-    (name "rust-tracing-fmt")
-    (version "0.1.1")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (crate-uri "tracing-fmt" version))
-       (file-name
-        (string-append name "-" version ".tar.gz"))
-       (sha256
-        (base32
-         "0wagcrd6w8d3k7zdvg6sy2bwfh8w87i6ndia69p54fc7p3z4f1c8"))))
-    (build-system cargo-build-system)
-    (arguments
-     `(#:cargo-inputs
-       (("rust-tracing-subscriber" ,rust-tracing-subscriber-0.1))
-       #:cargo-development-inputs
-       (("rust-tracing" ,rust-tracing-0.1))))
-    (home-page "https://tokio.rs")
-    (synopsis "Tracing subscriber that formats and logs trace data")
-    (description
-     "This package provides a tracing subscriber that formats and logs trace
-data.  Moved to the tracing-subscriber crate.")
-    (license license:expat)))
-
 (define-public rust-tracing-log-0.1
   (package
     (name "rust-tracing-log")