[Snyk] Upgrade org.postgresql:postgresql from 42.6.0 to 42.7.3

[wistefan]

Snyk has created this PR to upgrade org.postgresql:postgresql from 42.6.0 to 42.7.3.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 6 versions ahead of your current version.

• The recommended version was released on 5 months ago.

Issues fixed by the recommended upgrade:

	Issue	Score	Exploit Maturity
	SQL Injection SNYK-JAVA-ORGPOSTGRESQL-6252740	664	No Known Exploit

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[!IMPORTANT]

• Check the changes in this PR to ensure they won't cause issues with your project.
• This PR was automatically created by Snyk using the credentials of a real user.
• Max score is 1000. Note that the real score may have changed since the PR was raised.

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[coveralls]

coverage: 83.538%. remained the same when pulling 30eb5a0baafa71bb2f57e29a3449d7a6f0869601 on snyk-upgrade-0e4025ab638b6229c43d809c4cb3ca2e into 91a9ec4674e9002e29bb0e827047610195591b58 on main.