[Java][CI] Fix failure of Java CI on s390x

[asfimport]

ARROW-9701 causes the following failure due to missing a library libprotobuf.so.18.

...
[ERROR] PROTOC FAILED: /arrow/java/flight/flight-core/target/protoc-plugins/protoc-3.7.1-linux-s390_64.exe: error while loading shared libraries: libprotobuf.so.18: cannot open shared object file: No such file or directory
[ERROR] /arrow/java/flight/flight-core/../../../format/Flight.proto [0:0]: /arrow/java/flight/flight-core/target/protoc-plugins/protoc-3.7.1-linux-s390_64.exe: error while loading shared libraries: libprotobuf.so.18: cannot open shared object file: No such file or directory
...

Reporter: Kazuaki Ishizaki / @kiszk
Assignee: Kazuaki Ishizaki / @kiszk

PRs and other links:

• GitHub Pull Request #8368

_{Note: This issue was originally created as ARROW-10200. Please see the migration documentation for further details.}

[asfimport]

Kouhei Sutou / @kou:
Issue resolved by pull request 8368
#8368