gnu: double-conversion: Update to 3.1.5.

* gnu/packages/maths.scm (double-conversion): Update to 3.1.5.

gnu/packages/maths.scm

@@ -325,7 +325,7 @@ enough to be used effectively as a scientific calculator.")
 (define-public double-conversion
   (package
     (name "double-conversion")
-    (version "3.1.4")
+    (version "3.1.5")
     (home-page "https://github.com/google/double-conversion")
     (source (origin
               (method git-fetch)
@@ -334,7 +334,7 @@ enough to be used effectively as a scientific calculator.")
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "13xwcqk2c0q8c1siw566clxcpvp0xrxvb72mra42wa3nvq9wlsv6"))))
+                "0csy4pjw1p8rp6g5qxi2h0ychhhp1fldv7gb761627fs2mclw9gv"))))
     (build-system cmake-build-system)
     (arguments
      '(#:test-target "test"