Update vendored dependencies

vendor/github.com/golang/snappy/AUTHORS

vendor/github.com/golang/snappy/CONTRIBUTORS

vendor/github.com/golang/snappy/decode.go

vendor/github.com/golang/snappy/decode_other.go

vendor/github.com/golang/snappy/encode.go

vendor/github.com/golang/snappy/go.mod

vendor/github.com/syndtr/goleveldb/leveldb/batch.go

vendor/github.com/syndtr/goleveldb/leveldb/db.go

vendor/github.com/syndtr/goleveldb/leveldb/db_compaction.go

vendor/github.com/syndtr/goleveldb/leveldb/db_iter.go

vendor/github.com/syndtr/goleveldb/leveldb/db_snapshot.go

vendor/github.com/syndtr/goleveldb/leveldb/db_transaction.go

vendor/github.com/syndtr/goleveldb/leveldb/filter/bloom.go

vendor/github.com/syndtr/goleveldb/leveldb/memdb/memdb.go

vendor/github.com/syndtr/goleveldb/leveldb/opt/options.go

vendor/github.com/syndtr/goleveldb/leveldb/session.go

...github.com/syndtr/goleveldb/leveldb/session_compaction.go

vendor/github.com/syndtr/goleveldb/leveldb/session_util.go

vendor/github.com/syndtr/goleveldb/leveldb/table.go

vendor/github.com/syndtr/goleveldb/leveldb/table/reader.go