Upgrade pcre to pcre2-10.40

Test: make
Change-Id: I5d7243566be5bc6b8e2a5eaf08dec2d08a565f84
diff --git a/src/pcre2_string_utils.c b/src/pcre2_string_utils.c
index d6be01a..ebfa943 100644
--- a/src/pcre2_string_utils.c
+++ b/src/pcre2_string_utils.c
@@ -7,7 +7,7 @@
 
                        Written by Philip Hazel
      Original API code Copyright (c) 1997-2012 University of Cambridge
-          New API code Copyright (c) 2018 University of Cambridge
+          New API code Copyright (c) 2018-2021 University of Cambridge
 
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 Redistribution and use in source and binary forms, with or without