ARROW-7714: [Release] Add missing variable expansion
ARROW-7714: [Release] Add missing variable expansion

Closes #6313 from kou/release-verify-rc-wheels-missing-variable-expansion and squashes the following commits:

44008fd82 <Sutou Kouhei>  Add missing variable expansion

Authored-by: Sutou Kouhei <73218711cdd5d5c30ac66da3cc4d9d9204caf34b@clear-code.com>
Signed-off-by: Krisztián Szűcs <6bab32dc957a05a87930e779f272342e159326fa@gmail.com>

cpcloud/arrow,apache/arrow,icexelloss/arrow,wesm/arrow,icexelloss/arrow,wesm/arrow,xhochy/arrow,kou/arrow,apache/arrow,kou/arrow,icexelloss/arrow,xhochy/arrow,cpcloud/arrow,icexelloss/arrow,apache/arrow,cpcloud/arrow,apache/arrow,apache/arrow,xhochy/arrow,laurentgo/arrow,apache/arrow,laurentgo/arrow,xhochy/arrow,cpcloud/arrow,apache/arrow,laurentgo/arrow,cpcloud/arrow,cpcloud/arrow,xhochy/arrow,cpcloud/arrow,cpcloud/arrow,kou/arrow,wesm/arrow,laurentgo/arrow,laurentgo/arrow,wesm/arrow,xhochy/arrow,apache/arrow,laurentgo/arrow,xhochy/arrow,wesm/arrow,wesm/arrow,apache/arrow,laurentgo/arrow,apache/arrow,icexelloss/arrow,laurentgo/arrow,wesm/arrow,icexelloss/arrow,xhochy/arrow,laurentgo/arrow,kou/arrow,apache/arrow,apache/arrow,wesm/arrow,xhochy/arrow,wesm/arrow,icexelloss/arrow,wesm/arrow,icexelloss/arrow,laurentgo/arrow,wesm/arrow,laurentgo/arrow,cpcloud/arrow,xhochy/arrow,wesm/arrow,kou/arrow,cpcloud/arrow,laurentgo/arrow,xhochy/arrow,kou/arrow,wesm/arrow,xhochy/arrow,laurentgo/arrow,apache/arrow,icexelloss/arrow,icexelloss/arrow,xhochy/arrow,xhochy/arrow,icexelloss/arrow,icexelloss/arrow,kou/arrow,wesm/arrow,cpcloud/arrow,laurentgo/arrow,cpcloud/arrow,laurentgo/arrow,kou/arrow,icexelloss/arrow,kou/arrow,cpcloud/arrow,kou/arrow,kou/arrow,apache/arrow,xhochy/arrow,kou/arrow,kou/arrow,cpcloud/arrow,icexelloss/arrow,kou/arrow