Update librdkafka to version 1.4.2

[filimonov]

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Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Update librdkafka to version 1.4.2

Detailed description / Documentation draft:
I think it closes #5637 (See also: confluentinc/librdkafka#2183 (comment) )

[filimonov]

It looks like newer version behave a bit different

"2020.05.28 22:40:01.633450 [ 67 ] {} <Warning> StorageKafka (kafka): [thrd:main]: Consumer group session timed out (in join-state started) after 10498 ms without a successful response from the group coordinator (broker 1, last error was Success): revoking assignment and rejoining group"

It looks related to confluentinc/librdkafka#2631
So now it leaves the group preventing further commits. Acceptable.

Will try to adjust the test.

[alexey-milovidov]

Logical error:

2020.05.29 02:58:44.483982 [ 207 ] {} <Trace> test_3bd5c8.alter_table2: Renaming temporary part tmp_mut_-2_0_0_1_9 to -2_0_0_1_9.
2020.05.29 02:58:44.485340 [ 207 ] {} <Error> : Logical error: 'Part -2_0_0_1_9 intersects next part -2_0_0_2 (state Committed). It is a bug.'.

In test 00992_system_parts_race_condition_zookeeper

See #10066