gnu: Add rust-base64ct-1.0.1.

* gnu/packages/crates-io.scm (rust-base64ct-1.0.1): New variable.

This will be needed later because some packages request specifically this
version, probably due to some non-backwards compatible change.

Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>

gnu/packages/crates-io.scm

@@ -5809,6 +5809,20 @@ portable \"best effort\" constant-time operation and embedded-friendly
 @code{no_std} support.")
     (license (list license:asl2.0 license:expat))))
 
+(define-public rust-base64ct-1.0.1
+  (package
+    (inherit rust-base64ct-1)
+    (name "rust-base64ct")
+    (version "1.0.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "base64ct" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "0sx4a44c2n450lsmi0q1mgfbjhkw1sx57462cv77p0mmy9mgscla"))))
+    (arguments '())))
+
 (define-public rust-base-x-0.2
   (package
     (name "rust-base-x")