pcre2: Update to upstream version 10.42

Changelog: https://github.com/PCRE2Project/pcre2/blob/pcre2-10.42/ChangeLog

This should also fix support for RISC-V architectures, at least in the sljit
library.

modules/regex/config.py

@@ -1,5 +1,5 @@
 def can_build(env, platform):
-    return not env["arch"].startswith("rv")
+    return True
 
 
 def configure(env):