Info.plist: Bump LSMinimumSystemVersion to silence warning

Didn't remove the key-value pair since old Xcode behavior is not
known.

warning: LSMinimumSystemVersion of '10.9.0' is less than the value of
MACOSX_DEPLOYMENT_TARGET '10.13' - setting to '10.13'. (in target
'blender' from project 'Blender')

Reviewed By: #platform_macos, brecht
Differential Revision: https://developer.blender.org/D13831

release/darwin/Blender.app/Contents/Info.plist

@@ -3,7 +3,7 @@
 <plist version="1.0">
 <dict>
 	<key>LSMinimumSystemVersion</key>
-	<string>10.9.0</string>
+	<string>10.13</string>
 	<key>CFBundleDocumentTypes</key>
 	<array>
 		<dict>