Fix parameter tests timeout (backport #283)

[mergify]

This is an automatic backport of pull request #283 done by Mergify.

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[pablogs9]

@Acuadros95 https://build.ros2.org/job/Fpr__rclc__ubuntu_focal_amd64/182/consoleFull#console-section-29

[codecov-commenter]

Codecov Report

Merging #284 (9c9249c) into foxy (45a111e) will increase coverage by 0.08%.
The diff coverage is 55.55%.

@@            Coverage Diff             @@
##             foxy     #284      +/-   ##
==========================================
+ Coverage   60.23%   60.32%   +0.08%     
==========================================
  Files          14       14              
  Lines        1549     1555       +6     
  Branches      505      507       +2     
==========================================
+ Hits          933      938       +5     
  Misses        339      339              
- Partials      277      278       +1     

Impacted Files	Coverage Δ
...c_parameter/test/rclc_parameter/test_parameter.cpp	33.08% <55.55%> (+1.54%)	⬆️
rclc/src/rclc/executor.c	55.78% <0.00%> (+0.13%)	⬆️

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