gnu: mpfr: Update to 4.2.0.

* gnu/packages/multiprecision.scm (mpfr): Update to 4.2.0.

gnu/packages/multiprecision.scm

@@ -114,13 +114,13 @@ It is aimed at use in, for example, cryptography and computational algebra.")
 (define-public mpfr
   (package
    (name "mpfr")
-   (version "4.1.1")
+   (version "4.2.0")
    (source (origin
             (method url-fetch)
             (uri (string-append "mirror://gnu/mpfr/mpfr-" version
                                 ".tar.xz"))
             (sha256 (base32
-                     "0gf3ibi7kzz39zj72qc9r607clyhm80gs8wbp71zzfkxasyrblgz"))))
+                     "14yr4sf4mys64nzbgnd997l6l4n8l9vsjnnvnb0lh4jh2ggpi8q6"))))
    (build-system gnu-build-system)
    (outputs '("out" "debug"))
    (propagated-inputs (list gmp))            ; <mpfr.h> refers to <gmp.h>