gnu: freecad: Update to 0.21.0.

* gnu/packages/engineering.scm (freecad): Update to 0.21.0.
[inputs]: Add fmt.

gnu/packages/engineering.scm

@@ -2687,7 +2687,7 @@ comments.")))
 (define-public freecad
   (package
     (name "freecad")
-    (version "0.20.2")
+    (version "0.21.0")
     (source
      (origin
        (method git-fetch)
@@ -2696,7 +2696,7 @@ comments.")))
              (commit version)))
        (file-name (git-file-name name version))
        (sha256
-        (base32 "0wsfz2jqfhmqshyr1n4qxcc3c6a96gyll4h34vn2zzvvcnncn9rb"))))
+        (base32 "1i1wv3swnnimmn3kwphb2fcmsc64z96rcg7fhfsgqxcbyrygw6w7"))))
     (build-system qt-build-system)
     (native-inputs
      (list doxygen
@@ -2710,6 +2710,7 @@ comments.")))
            coin3D
            double-conversion
            eigen
+           fmt
            fontconfig
            freetype
            gl2ps