Bump hadoop2.version from 2.7.3 to 2.7.7#12

dependabot[bot] wants to merge 1 commit intorel/0.12irvine0109/iotdb:rel/0.12from

dependabot/maven/rel/0.12/hadoop2.version-2.7.7irvine0109/iotdb:dependabot/maven/rel/0.12/hadoop2.version-2.7.7Copy head branch name to clipboard