gnu: Add rust-spki-0.6.

* gnu/packages/crates-io.scm (rust-spki-0.6): New variable.

gnu/packages/crates-io.scm

@@ -59629,6 +59629,27 @@ describing public keys as well as their associated AlgorithmIdentifiers (i.e.
 OIDs)")
     (license (list license:asl2.0 license:expat))))
 
+(define-public rust-spki-0.6
+  (package
+    (inherit rust-spki-0.7)
+    (name "rust-spki")
+    (version "0.6.0")
+    (source (origin
+              (method url-fetch)
+              (uri (crate-uri "spki" version))
+              (file-name (string-append name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "0ar1ldkl7svp8l3gfw2hyiiph7n2nqynjnjgdv1pscvsmjxh5kv7"))))
+    (arguments
+     `(#:cargo-inputs
+       (("rust-base64ct" ,rust-base64ct-1)
+        ("rust-der" ,rust-der-0.6)
+        ("rust-sha2" ,rust-sha2-0.10))
+       #:cargo-development-inputs
+       (("rust-hex-literal" ,rust-hex-literal-0.3)
+        ("rust-tempfile" ,rust-tempfile-3))))))
+
 (define-public rust-spki-0.4
   (package
     (inherit rust-spki-0.7)