Require OpenSSL Extension

[IlicMiljan]

Description of Changes

PHP OpenSSL extension is required by the library for encryption to work, and this PR adds the ext-openssl requirement to composer.json.

How Has This Been Tested?

Validated composer.json file with composer validate.

Checklist

Please confirm the following:

• I have tested my changes and corrected any errors.
• I have documented my changes if necessary.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.50%. Comparing base (ba76fac) to head (d96a84d).

Additional details and impacted files

@@            Coverage Diff            @@
##               main       #6   +/-   ##
=========================================
  Coverage     95.50%   95.50%           
  Complexity       55       55           
=========================================
  Files            14       14           
  Lines           178      178           
=========================================
  Hits            170      170           
  Misses            8        8           

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