Upstream's python/meson.build passes install_tag as a single-element
array to python.extension_module(), which builds exactly one file. Meson
1.11 tightened install_tag on extension_module() to a scalar str (arrays
are only valid for multi-output targets like the SWIG custom_target),
so the build aborts at configure time. Pass the tag as a scalar.

https://github.com/tschoonj/xraylib/blob/master/python/meson.build
--- a/python/meson.build
+++ b/python/meson.build
@@ -54,7 +54,7 @@
         install: true,
         install_dir: python.get_install_dir(pure: false),
         c_args: core_c_args + ['-I' + numpy_header_location] + python_error_flags,
-        install_tag: ['python-runtime']
+        install_tag: 'python-runtime'
     )
     python_enabled = true
 endif
@@ -86,7 +86,7 @@
         install: true,
         install_dir: python.get_install_dir(pure: false),
         c_args: core_c_args + ['-I' + numpy_header_location] + python_error_flags,
-        install_tag: ['python-runtime'],
+        install_tag: 'python-runtime',
     )
     python_numpy_enabled = true
 endif