[Snyk] Security upgrade com.datastax.astra:astra-spring-boot-starter from 0.4 to 0.7.0

[clun]

This PR was automatically created by Snyk using the credentials of a real user.

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:
  • backend/pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	641/1000 Why? Recently disclosed, Has a fix available, CVSS 7.1	Uncontrolled Resource Consumption ('Resource Exhaustion') SNYK-JAVA-CHQOSLOGBACK-6097492	com.datastax.astra:astra-spring-boot-starter: 0.4 -> 0.7.0	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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🦉 Uncontrolled Resource Consumption ('Resource Exhaustion')