meson: bump version to 0.50
This MR gets rid of the warning
WARNING: Project targeting '>= 0.49.0' but tried to use feature introduced in '0.50.0': install arg in configure_file.
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This MR gets rid of the warning
WARNING: Project targeting '>= 0.49.0' but tried to use feature introduced in '0.50.0': install arg in configure_file.