bump macos version used for CI from 12 to 13

[cooljeanius]

also configure yamllint

[cooljeanius]

ok, so, the failures here are actually legitimate, so I'm going to need to dig into the actual code here to fix it...

[cooljeanius]

nsfont.m:292:59: warning: using %s directive in NSString which is being passed as a formatting argument to the formatting method [-Wcstring-format-directive]
      ascii_printable = [[NSString alloc] initWithFormat: @"%s", chars];
                                                          ^
/Applications/Xcode_15.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSString.h:380:1: note: method 'initWithFormat:' declared here
- (instancetype)initWithFormat:(NSString *)format, ... NS_FORMAT_FUNCTION(1,2);
^
nsfont.m:908:28: error: 'ATSFontFindFromPostScriptName' is unavailable
      ATSFontRef atsFont = ATSFontFindFromPostScriptName
                           ^
/Applications/Xcode_15.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framework/Headers/ATSFont.h:828:1: note: 'ATSFontFindFromPostScriptName' has been explicitly marked unavailable here
ATSFontFindFromPostScriptName(
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
1 warning and 2 errors generated.
gmake[1]: *** [Makefile:463: nsfont.o] Error 1
gmake[1]: *** Waiting for unfinished jobs....

[cooljeanius]

OK