[Snyk] Security upgrade com.fasterxml.jackson.core:jackson-databind from 2.12.1 to 2.12.6

[svcprodsec-sendgrid]

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:
  • pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	581/1000 Why? Recently disclosed, Has a fix available, CVSS 5.9	Denial of Service (DoS) SNYK-JAVA-COMFASTERXMLJACKSONCORE-2326698	com.fasterxml.jackson.core:jackson-databind: 2.12.1 -> 2.12.6	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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[childish-sambino]

Fixed by https://github.com/sendgrid/sendgrid-java/pull/723