Prevent major version upgrades in docker-compose/elasticsearch/v6/docker-compose.yml

[renovate-bot]

renovate bot tried to bump it to v7

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.87%. Comparing base (3b9428e) to head (0bd2b4a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5710   +/-   ##
=======================================
  Coverage   96.87%   96.87%           
=======================================
  Files         334      334           
  Lines       16144    16146    +2     
=======================================
+ Hits        15639    15641    +2     
  Misses        335      335           
  Partials      170      170           

Flag	Coverage Δ
badger_v1	8.06% <ø> (-0.01%)	⬇️
badger_v2	1.90% <ø> (-0.01%)	⬇️
cassandra-3.x-v1	16.62% <ø> (-0.01%)	⬇️
cassandra-3.x-v2	1.82% <ø> (-0.01%)	⬇️
cassandra-4.x-v1	16.62% <ø> (-0.01%)	⬇️
cassandra-4.x-v2	1.82% <ø> (-0.01%)	⬇️
elasticsearch-7.x-v1	18.86% <ø> (-0.01%)	⬇️
elasticsearch-8.x-v1	19.05% <ø> (+<0.01%)	⬆️
elasticsearch-8.x-v2	19.04% <ø> (-0.01%)	⬇️
grpc_v1	9.46% <ø> (+<0.01%)	⬆️
grpc_v2	7.39% <ø> (-0.02%)	⬇️
kafka	9.75% <ø> (-0.01%)	⬇️
opensearch-1.x-v1	18.91% <ø> (-0.01%)	⬇️
opensearch-2.x-v1	18.90% <ø> (-0.01%)	⬇️
opensearch-2.x-v2	18.90% <ø> (-0.02%)	⬇️
unittests	95.26% <ø> (+<0.01%)	⬆️

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