octave: revision bump (sundials 6.5.0)

Closes #119907.

Signed-off-by: Patrick Linnane <patrick@linnane.io>
Signed-off-by: Rui Chen <rui@chenrui.dev>
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-7.3.0.tar.xz"
   sha256 "a508ee6aebccfa68967c9e7e0a08793c4ca8e4ddace723aabdb8f71ad34d57f1"
   license "GPL-3.0-or-later"
-  revision 1
+  revision 2
 
   bottle do
     sha256 arm64_ventura:  "886881e62fb6ee1472687a3e1fa476d3572f54665b80ba8e841071bc25054eb3"
@@ -82,6 +82,9 @@ class Octave < Formula
               /%OCTAVE_CONF_OCT(AVE)?_LINK_(DEPS|OPTS)%/,
               '""'
 
+    # SUNDIALS 6.4.0 and later needs C++14 for C++ based features
+    ENV.append "CXXFLAGS", "-std=c++14"
+
     # Qt 5.12 compatibility
     # https://savannah.gnu.org/bugs/?55187
     ENV["QCOLLECTIONGENERATOR"] = "qhelpgenerator"