Fix leak in ReliableTopicListenerRunner.next API-1514

[srknzl]

Clean cherry-picked backport of #1377

I will merge this PR with one approval.

[codecov]

Codecov Report

Merging #1379 (917b53c) into 5.1.x (baa1fa9) will decrease coverage by 0.37%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            5.1.x    #1379      +/-   ##
==========================================
- Coverage   92.12%   91.74%   -0.38%     
==========================================
  Files         463      463              
  Lines       16347    16347              
  Branches     1329     1329              
==========================================
- Hits        15060    14998      -62     
- Misses        897      954      +57     
- Partials      390      395       +5     

Impacted Files	Coverage Δ
src/proxy/EntryListener.ts	100.00% <ø> (ø)
src/proxy/topic/ReliableTopicListenerRunner.ts	82.22% <100.00%> (ø)
src/codec/ClientAuthenticationCustomCodec.ts	42.22% <0.00%> (-33.34%)	⬇️
src/network/ConnectionManager.ts	75.35% <0.00%> (-8.46%)	⬇️
src/invocation/InvocationService.ts	93.33% <0.00%> (-1.97%)	⬇️
src/core/HazelcastError.ts	76.51% <0.00%> (-1.52%)	⬇️
src/protocol/ErrorFactory.ts	63.90% <0.00%> (-1.51%)	⬇️
src/config/ConfigBuilder.ts	89.67% <0.00%> (-1.01%)	⬇️
src/invocation/ClusterService.ts	94.01% <0.00%> (-0.86%)	⬇️
src/util/Util.ts	87.89% <0.00%> (ø)
... and 2 more

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[srknzl]

The coverage differences must be due to not running EE tests on maintenance branch PRs.