Bump versions to 0.59.4 for release

This release only contains a fix for a cuda-related regression in the
0.59.3 stable release:

https://github.com/mesonbuild/meson/pull/9469

man/meson.1

@@ -1,4 +1,4 @@
-.TH MESON "1" "October 2021" "meson 0.59.3" "User Commands"
+.TH MESON "1" "October 2021" "meson 0.59.4" "User Commands"
 .SH NAME
 meson - a high productivity build system
 .SH DESCRIPTION

mesonbuild/coredata.py

@@ -43,7 +43,7 @@ if T.TYPE_CHECKING:
     KeyedOptionDictType = T.Union[T.Dict['OptionKey', 'UserOption[T.Any]'], OptionOverrideProxy]
     CompilerCheckCacheKey = T.Tuple[T.Tuple[str, ...], str, str, T.Tuple[str, ...], str]
 
-version = '0.59.3'
+version = '0.59.4'
 backendlist = ['ninja', 'vs', 'vs2010', 'vs2012', 'vs2013', 'vs2015', 'vs2017', 'vs2019', 'xcode']
 
 default_yielding = False