[GLib] Parquet C++ is required

[kou]

Describe the bug, including details regarding any error messages, version, and platform.

arrow/c_glib/meson.build

Lines 189 to 194 in fe5e0e5

	parquet = dependency(
	'parquet',
	'Parquet',
	kwargs: common_args,
	modules: ['Parquet::parquet_shared'],
	)

doesn't have required: false.

c_glib/parquet-glib/ is optional. So we should have required: false.

Component(s)

GLib

[kou]

Issue resolved by pull request 48785
#48785