[Snyk] Fix for 1 vulnerabilities

[twilio-product-security]

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:
  • tools/automation/markdown-parser/pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	671/1000 Why? Recently disclosed, Has a fix available, CVSS 7.7	Deserialization of Untrusted Data SNYK-JAVA-COMGOOGLECODEGSON-1730327	com.google.code.gson:gson: 2.2.4 -> 2.8.9 org.seleniumhq.selenium:selenium-firefox-driver: 2.53.0 -> 3.14.0 org.seleniumhq.selenium:selenium-java: 2.53.0 -> 3.14.0 org.seleniumhq.selenium:selenium-server: 2.53.0 -> 3.14.0	Yes	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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