chore: remove unused spring dependency and usage

[kburger]

Spring was referenced but not used used. For future work: this is the output of mvn dependency:analyze -DignoreNonCompile=true

[INFO] --- dependency:3.7.0:analyze (default-cli) @ FairDataPointSchemaTool ---
[WARNING] Used undeclared dependencies found:
[WARNING]    org.eclipse.rdf4j:rdf4j-model-api:jar:5.3.1:compile
[WARNING]    org.eclipse.rdf4j:rdf4j-repository-api:jar:5.3.1:compile
[WARNING]    org.eclipse.rdf4j:rdf4j-model:jar:5.3.1:compile
[WARNING]    com.fasterxml.jackson.core:jackson-annotations:jar:2.21:compile
[WARNING]    org.eclipse.rdf4j:rdf4j-sail-api:jar:5.3.1:compile
[WARNING]    org.junit.jupiter:junit-jupiter-api:jar:5.9.3:test
[WARNING]    org.apache.httpcomponents:httpcore:jar:4.4.16:compile
[WARNING]    org.eclipse.rdf4j:rdf4j-rio-api:jar:5.3.1:compile
[WARNING] Unused declared dependencies found:
[WARNING]    org.apache.poi:poi-ooxml-schemas:jar:4.1.2:compile
[WARNING]    ch.qos.logback:logback-core:jar:1.5.32:compile
[WARNING]    org.modelmapper:modelmapper:jar:3.2.6:compile
[WARNING]    org.apache.poi:poi-ooxml:jar:5.5.1:compile

The 'unused declared' could be removed as well (after thorough testing).

[servicedesk-health-ri]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud