Bump bash shell integration to version 5 because of a security concern with...

Bump bash shell integration to version 5 because of a security concern with evaluating text in backticks or $(...) in a directory name when you cd into it

sources/VT100Screen.m

@@ -3916,7 +3916,7 @@ static NSString *const kInilineFileInset = @"inset";  // NSValue of NSEdgeInsets
     
     NSDictionary<NSString *, NSNumber *> *lastVersionByShell =
         @{ @"tcsh": @2,
-           @"bash": @4,
+           @"bash": @5,
            @"zsh": @5,
            @"fish": @5 };
     NSInteger latestKnownVersion = [lastVersionByShell[shell ?: @""] integerValue];