feat(carousel): tries to update itemsPerSlide

[SvetlanaMuravlova]

feat(carousel): tries to update itemsPerSlide
refs #5723 #5963

[github-actions]

Visit the preview URL for this PR (updated for commit 7661bcc):

https://ngx-bootstrap-demo--pr6249-feat-dynamic-perslid-bc7smb9g.web.app

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[codecov]

Codecov Report

Merging #6249 (10b3726) into development (c0beddb) will increase coverage by 0.36%.
The diff coverage is 100.00%.

❗ Current head 10b3726 differs from pull request most recent head 7661bcc. Consider uploading reports for the commit 7661bcc to get more accurate results

@@               Coverage Diff               @@
##           development    #6249      +/-   ##
===============================================
+ Coverage        77.55%   77.91%   +0.36%     
===============================================
  Files              302      302              
  Lines            10549    10556       +7     
  Branches          2583     2584       +1     
===============================================
+ Hits              8181     8225      +44     
+ Misses            2358     2321      -37     
  Partials            10       10              

Impacted Files	Coverage Δ
src/carousel/carousel.component.ts	49.72% <100.00%> (+8.68%)	⬆️
src/carousel/utils.ts	93.75% <0.00%> (+56.25%)	⬆️

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[cypress]

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Test summary

86 • 1 • 6 • 0

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Run details

Project	ngx-bootstrap
Status	Failed
Commit	10b3726 ℹ️
Started	Jul 30, 2021 11:03 AM
Ended	Jul 30, 2021 11:08 AM
Duration	05:03 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 87

View run in Cypress Dashboard ➡️

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Failures

	src/integration/carousel_page_spec.ts		1
1	Carousel page testing suite > Basic > when user click on left/right arrow - previous/next slide shown

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