gnu: Add rust-crates-io-0.31.

* gnu/packages/crates-io.scm (rust-crates-io-0.31): New variable.

gnu/packages/crates-io.scm

@@ -14059,6 +14059,28 @@ to @code{is_x86_feature_detected}.")
 @url{crates.io}.")
     (license (list license:expat license:asl2.0))))
 
+(define-public rust-crates-io-0.31
+  (package
+    (inherit rust-crates-io-0.33)
+    (name "rust-crates-io")
+    (version "0.31.1")
+    (source (origin
+              (method url-fetch)
+              (uri (crate-uri "crates-io" version))
+              (file-name (string-append name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "0jhx0pgprlzypq037rkdsc2k3knlimx2vp5k7vwyvsa6iaa7gy89"))))
+    (arguments
+     `(#:cargo-inputs
+       (("rust-anyhow" ,rust-anyhow-1)
+        ("rust-curl" ,rust-curl-0.4)
+        ("rust-percent-encoding" ,rust-percent-encoding-2)
+        ("rust-serde" ,rust-serde-1)
+        ("rust-serde-derive" ,rust-serde-derive-1)
+        ("rust-serde-json" ,rust-serde-json-1)
+        ("rust-url" ,rust-url-2))))))
+
 (define-public rust-crc-1
   (package
     (name "rust-crc")