Fix RabbitMQ connection leaks

[sungam3r]

fixes #2048

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[unaizorrilla]

Hi @sungam3r

LGTM but Can you also upgrade the package version on the pr?

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 91.30435% with 6 lines in your changes missing coverage. Please review.

Project coverage is 64.42%. Comparing base (fb04fe8) to head (706fcd4).
Report is 26 commits behind head on master.

Files	Patch %	Lines
...yInjection/RabbitMQHealthCheckBuilderExtensions.cs	92.53%	2 Missing and 3 partials ⚠️
src/HealthChecks.Rabbitmq/RabbitMQHealthCheck.cs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2153       +/-   ##
===========================================
+ Coverage    0.00%   64.42%   +64.42%     
===========================================
  Files           7      248      +241     
  Lines         356     8368     +8012     
  Branches       28      586      +558     
===========================================
+ Hits            0     5391     +5391     
- Misses        356     2830     +2474     
- Partials        0      147      +147     

Flag	Coverage Δ
RabbitMQ	48.76% <91.30%> (?)

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