[Snyk] Fix for 2 vulnerabilities

[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	Denial of Service (DoS) SNYK-JAVA-CHQOSLOGBACK-6094942	com.datastax.astra:astra-spring-boot-starter: 0.4 -> 0.7.0	No	No Known Exploit
	716/1000 Why? Recently disclosed, Has a fix available, CVSS 8.6	Improper Input Validation SNYK-JAVA-ORGAPACHETOMCATEMBED-6092281		No	No Known Exploit

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

Vulnerabilities that could not be fixed

• Upgrade:
  • Could not upgrade org.springframework.boot:[email protected] to org.springframework.boot:[email protected]; Reason could not apply upgrade, dependency is managed externally ; Location: https://maven-central.storage-download.googleapis.com/maven2/org/springframework/boot/spring-boot-dependencies/2.6.1/spring-boot-dependencies-2.6.1.pom

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🦉 Denial of Service (DoS) 🦉 Improper Input Validation