Updated Handlebars v4.7.6 -> v4.7.7

[joelit]

Reasons for creating this PR

The version of Handlebars library needed updating due to a vulnerability.

Link to relevant issue(s), if any

• Closes Upgrade Handlebars (was: List of vulnerabilitys (scaned with grype) ) #1269

Description of the changes in this PR

Known problems or uncertainties in this PR

Checklist

• phpUnit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if not, explain why below)
• The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)

Tested that the components using handlebars work under v4.7.7:

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #1305 (443c4c0) into master (dd94d44) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1305   +/-   ##
=========================================
  Coverage     69.44%   69.44%           
  Complexity     1657     1657           
=========================================
  Files            32       32           
  Lines          4068     4068           
=========================================
  Hits           2825     2825           
  Misses         1243     1243           

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