gnu: Remove rust-hashlink-0.6.

* gnu/packages/crates-io.scm (rust-hashlink-0.6): Delete variable.

gnu/packages/crates-io.scm

@@ -26189,26 +26189,6 @@ hash map.")
 their key-value pairs in a user controllable order.")
     (license (list license:expat license:asl2.0))))
 
-(define-public rust-hashlink-0.6
-  (package
-    (inherit rust-hashlink-0.7)
-    (name "rust-hashlink")
-    (version "0.6.0")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (crate-uri "hashlink" version))
-       (file-name (string-append name "-" version ".tar.gz"))
-       (sha256
-        (base32 "1a2gi4737lmqq1i48b9w13gvbkh4g3gc7gj6d3974hywy21gg76r"))))
-    (arguments
-     `(#:skip-build? #t
-       #:cargo-inputs
-       (("rust-hashbrown" ,rust-hashbrown-0.9)
-        ("rust-serde" ,rust-serde-1))
-       #:cargo-development-inputs
-       (("rust-serde-test" ,rust-serde-test-1))))))
-
 (define-public rust-hdrhistogram-6
   (package
     (name "rust-hdrhistogram")