gnu: manifold: Update to 3.1.1.

* gnu/packages/engineering.scm (manifold): Update to 3.1.1.

Change-Id: Ic502f8d2acbc21592709e232bc03cd930a890414
Signed-off-by: Maxim Cournoyer <maxim@guixotic.coop>

gnu/packages/engineering.scm

@@ -3013,21 +3013,18 @@ specification can be downloaded at @url{http://3mf.io/specification/}.")
     (license license:bsd-2)))
 
 (define-public manifold
-  (let ((commit "7c8fbe186aa1ac5eb73f12c28bdef093ee4d11c9")
-        (version "3.0.1")
-        (revision "0"))
   (package
     (name "manifold")
-      (version (git-version version revision commit))
+    (version "3.1.1")
     (source
      (origin
        (method git-fetch)
        (uri (git-reference
              (url "https://github.com/elalish/manifold")
-               (commit commit)))
+             (commit (string-append "v" version))))
        (file-name (git-file-name name version))
        (sha256
-          (base32 "09s4r4hlarl5lzbbihfd1fpfd3987lma5m26wkkvi7zssdbis9zc"))))
+        (base32 "1vipfy68crvik3760jjmsqnyci6rabb26iiw22p2qpb3cj6r683l"))))
     (build-system cmake-build-system)
     (inputs (list tbb clipper2 assimp python-nanobind googletest))
     (arguments
@@ -3041,7 +3038,7 @@ object, and so is very important in manufacturing, CAD, structural analysis,
 etc..  Manifold also supports arbitrary vertex properties and enables mapping
 of materials for rendering use-cases.")
     (home-page "https://github.com/elalish/manifold")
-      (license license:asl2.0))))
+    (license license:asl2.0)))
 
 (define-public python-keithley2600
   (package