[pugixml] update to release 1.14

[JanMarvin]

No description provided.

[olivroy]

I don't remember how it was before, but seeing this now when loading openxlsx2.

   xlsb.cpp:n function 'int workbook_bin(std::string, std::string, bool)
   xlsb.cpp:1609:25:warning: used variable 'fields2-Wunused-variable
    1609 |         BrtNameFields2 *fields2rtNameFields2 *)&BrtNameUint2;
         |                         ^~~~~~~
   g++ -std=gnu++17 -shared -static-libgcc -o openxlsx2.dll tmp.def RcppExports.o helper_functions.o load_workbook.o pugi.o strings_xml.o styles_xml.o write_file.o xlsb.o -LC:/rtools43/x86_64-w64-mingw32.static.posix/lib/x64 -LC:/rtools43/x86_64-w64-mingw32.static.posix/lib -LC:/PROGRA~1/R/R-43~1.1/bin/x64 -lR
   installing to C:/../AppData/Local/Temp/RtmpsRMdpM/devtools_install_6a6c5419867/00LOCK-openxlsx2/00new/openxlsx2/libs/x64

[JanMarvin]

Oh, that's from the xlsb part. Thanks, I'll comment this, not sure why my systems didn't catch this. Thanks.