octave: enable qscintilla2 editor

- The library "qscintilla2" is required to build Octave's builtin editor widget
  (see #61141).

- Update revision number.

octave.rb: increment revision number

Closes #61142.

Signed-off-by: Sean Molenaar <1484494+SMillerDev@users.noreply.github.com>
Signed-off-by: BrewTestBot <1589480+BrewTestBot@users.noreply.github.com>

Formula/octave.rb

@@ -5,7 +5,7 @@ class Octave < Formula
   mirror "https://ftpmirror.gnu.org/octave/octave-5.2.0.tar.xz"
   sha256 "2757b5cc1854c9326d6c99d2900c7cec2909ac7ed500212d170d0df592bfd26b"
   license "GPL-3.0"
-  revision 9
+  revision 10
 
   livecheck do
     url :stable
@@ -53,6 +53,7 @@ class Octave < Formula
   depends_on "pstoedit"
   depends_on "qhull"
   depends_on "qrupdate"
+  depends_on "qscintilla2"
   depends_on "qt"
   depends_on "readline"
   depends_on "suite-sparse"