[Snyk] Security upgrade fastify from 2.13.0 to 2.15.1

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `yarn` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • yarn.lock

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Denial of Service (DoS) SNYK-JS-FASTIFY-595959	No	Proof of Concept

Check the changes in this PR to ensure they won't cause issues with your project.

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Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.

For more information:
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📚 Read more about Snyk's upgrade and patch logic

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #60 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #60   +/-   ##
=======================================
  Coverage   78.64%   78.64%           
=======================================
  Files          28       28           
  Lines         412      412           
  Branches       56       56           
=======================================
  Hits          324      324           
  Misses         88       88           

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