deps: update junit5 monorepo to v5.10.3

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.junit.jupiter:junit-jupiter-api (source)	5.10.2 -> 5.10.3
org.junit.jupiter:junit-jupiter-params (source)	5.10.2 -> 5.10.3
org.junit:junit-bom (source)	5.10.2 -> 5.10.3
org.junit.jupiter:junit-jupiter-engine (source)	5.10.2 -> 5.10.3
org.junit.vintage:junit-vintage-engine (source)	5.10.2 -> 5.10.3

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[sonarcloud[bot]]

Quality Gate passed for 'gapic-generator-java-root'

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 SonarCloud

[sonarcloud[bot]]

Quality Gate passed for 'java_showcase_integration_tests'

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 SonarCloud