arrow

GH-37535: [C++][Parquet] Add missing "thrift" dependency in parquet.pc (#37603)

### Rationale for this change

GH-37399 removed "thrift" pkg-config package dependency from "parquet" pkg-config package accidentally. 
Before GH-37399, "arrow" pkg-config packages has "thrift" pkg-config package dependency as `Requires.private`.

### What changes are included in this PR?

Add "thrift" to `Requires.private` of `parquet.pc`.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

Yes.
* Closes: #37535

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