[Snyk] Security upgrade org.yaml:snakeyaml from 1.30 to 1.31

[snyk-bot]

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

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • confectory-datamapper-snakeyaml/pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	661/1000 Why? Recently disclosed, Has a fix available, CVSS 7.5	Denial of Service (DoS) SNYK-JAVA-ORGYAML-2806360	org.yaml:snakeyaml: 1.30 -> 1.31	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

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

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[codecov]

Codecov Report

Merging #94 (411bed6) into master (48d6310) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #94   +/-   ##
=========================================
  Coverage     99.16%   99.16%           
  Complexity      384      384           
=========================================
  Files            63       63           
  Lines           717      717           
  Branches         51       51           
=========================================
  Hits            711      711           
  Misses            5        5           
  Partials          1        1           

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