Update Clang version from 19 to 20 in scan-build.1.

Similar to D110763.

Author: fcambus

clang/tools/scan-build/man/scan-build.1

@@ -2,9 +2,9 @@
 .\" See https://llvm.org/LICENSE.txt for license information.
 .\" SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 .\" $Id$
-.Dd Feb 10, 2024
+.Dd Aug 18, 2024
 .Dt SCAN-BUILD 1
-.Os "clang" "19"
+.Os "clang" "20"
 .Sh NAME
 .Nm scan-build
 .Nd Clang static analyzer