expat: Update to version 2.5.0

expat: Update to version 2.5.0

- Update from version 2.4.9 to 2.5.0
- Update of rootfile.
- Changelog
    Release 2.5.0 Tue October 25 2022
        Security fixes:
	  #616 #649 #650  CVE-2022-43680 -- Fix heap use-after-free after overeager
	                    destruction of a shared DTD in function
	                    XML_ExternalEntityParserCreate in out-of-memory situations.
	                    Expected impact is denial of service or potentially
	                    arbitrary code execution.
        Bug fixes:
	       #612 #645  Fix curruption from undefined entities
	       #613 #654  Fix case when parsing was suspended while processing nested
	                    entities
	  #616 #652 #653  Stop leaking opening tag bindings after a closing tag
	                    mismatch error where a parser is reset through
	                    XML_ParserReset and then reused to parse
	            #656  CMake: Fix generation of pkg-config file
	            #658  MinGW|CMake: Fix static library name
        Other changes:
	            #663  Protect header expat_config.h from multiple inclusion
	            #666  examples: Make use of XML_GetBuffer and be more
	                    consistent across examples
	            #648  Address compiler warnings
	       #667 #668  Version info bumped from 9:9:8 to 9:10:8;
	                    see https://verbump.de/ for what these numbers do

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>