Bump version on main branch to 4.0.0 (AcademySoftwareFoundation#2117)

The RB-3.4 branch has been made, so the version on the main branch
should go up.  The version on the main branch should be the *next*
release, after the upcoming v3.4 release.

Signed-off-by: Cary Phillips <[email protected]>

Author: cary-ilm

src/lib/OpenEXRCore/openexr_version.h

@@ -8,8 +8,8 @@
 #ifndef INCLUDED_OPENEXR_VERSION_H
 #    define INCLUDED_OPENEXR_VERSION_H
 
-#    define OPENEXR_VERSION_MAJOR 3
-#    define OPENEXR_VERSION_MINOR 4
+#    define OPENEXR_VERSION_MAJOR 4
+#    define OPENEXR_VERSION_MINOR 0
 #    define OPENEXR_VERSION_PATCH 0
 
 #endif