Change apt_key_url to avoid redirection and possible play failure

[4SH-gaupee]

EDIT : Fix typo in summary to avoid misunderstanding to anyone looking at this PR in the future

SUMMARY

Current url cause breaking when installing the repo (here's a result after beeing redirected)

This change set the proper url to retreive key files (https://pgp.mongodb.com)

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

roles/mongodb_repository/defaults/main.yml

ADDITIONAL INFORMATION

Running an install will fail because the retrieved apt key is broken.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.40%. Comparing base (42d35bd) to head (1175278).
Report is 22 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #681      +/-   ##
==========================================
- Coverage   73.68%   73.40%   -0.29%     
==========================================
  Files           6        6              
  Lines         935      940       +5     
  Branches      144      145       +1     
==========================================
+ Hits          689      690       +1     
- Misses        210      211       +1     
- Partials       36       39       +3     

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