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GH-41227: [CI][Release][GLib][Conda] Unpin gobject-introspection (#41228)

### Rationale for this change

Upstream problem https://github.com/conda-forge/glib-feedstock/pull/174 has been fixed.

### What changes are included in this PR?

Revert pinning.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* GitHub Issue: #41227

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>