chore(deps): update Spring Boot and Gradle wrapper

[deniswsrosa]

Summary

• Updates the Spring Boot Gradle plugin from 4.0.6 to 4.1.0.
• Updates the Gradle wrapper distribution from 9.5.0 to 9.6.1.
• Preserves the existing Gradle build tooling and keeps the diff limited to dependency metadata plus a CI action dependency update needed for GitHub Actions compatibility.

Hermes Kanban task: t_3e9f43f6

Dependency updates

Ecosystem	Dependency	Previous	Updated	Type	Notes
Gradle	org.springframework.boot Gradle plugin	4.0.6	4.1.0	Direct build plugin	Latest stable release from Maven metadata. Existing Dependabot PR #86 also proposed this update; operator requested a Hermes PR anyway.
Gradle wrapper	Gradle distribution	9.5.0	9.6.1	Build tool wrapper	Updated with ./gradlew wrapper --gradle-version 9.6.1 --distribution-type bin. Existing Dependabot PR #88 also proposed this update; operator requested a Hermes PR anyway.
GitHub Actions	ravsamhq/notify-slack-action	v1	v2	CI action dependency	Updated after CI showed v1's Docker action failing under its bundled Python dependency path (TypeError: 'type' object is not subscriptable) even after tests completed. v2 uses node20 with compatible inputs.

Dependencies checked but not changed

Dependency	Current	Latest stable checked	Reason
io.spring.dependency-management Gradle plugin	1.1.7	1.1.7	Already current.
io.github.cdimascio:dotenv-java	3.2.0	3.2.0	Already current.
org.springdoc:springdoc-openapi-starter-webmvc-ui	3.0.3	3.0.3	Already current.

Validation

./gradlew wrapper --gradle-version 9.6.1 --distribution-type bin
python3 -c "import yaml; yaml.safe_load(open('.github/workflows/tests.yaml'))"
./gradlew clean test --stacktrace
DB_CONN_STR=couchbase://127.0.0.1 DB_USERNAME=<local-admin> DB_PASSWORD=<local-password> ./gradlew clean test --stacktrace
DB_CONN_STR=couchbase://127.0.0.1 DB_USERNAME=<local-admin> DB_PASSWORD=<local-password> ./gradlew bootRun
curl -fsS http://127.0.0.1:8080/v3/api-docs
curl -fsS http://127.0.0.1:8080/api/v1/airline/airline_10

Check	Outcome	Evidence
Wrapper regeneration	Passed	Gradle wrapper now resolves Gradle 9.6.1.
Workflow YAML parse	Passed	.github/workflows/tests.yaml parsed successfully and uses ravsamhq/notify-slack-action@v2.
Tests without Couchbase env	Failed as expected	Spring could not resolve DB_CONN_STR; this repository's integration tests require Couchbase credentials/environment.
Tests with local Couchbase travel-sample	Passed	BUILD SUCCESSFUL in 40s; 18 integration tests executed.
Swagger/OpenAPI browser evidence	Passed	Swagger UI loaded at http://127.0.0.1:8080/swagger-ui/index.html showing API title, OAS 3.1 docs, and Route/Airport/Airline endpoint groups. Screenshot captured locally as swagger-ui.png.
Live API evidence	Passed	GET /api/v1/airline/airline_10 returned 40-Mile Air from travel-sample. Screenshot captured locally as airline-api-response.png; JSON response captured locally as airline_10.json.
OpenAPI evidence	Passed	/v3/api-docs returned title Quickstart in Couchbase with Spring Data, version 2.0, and 8 paths.

Evidence status

• Browser evidence: passed, screenshots captured locally during Hermes run.
• Swagger/OpenAPI evidence: passed.
• API evidence: passed against local Couchbase travel-sample.
• Screenshot artifacts are not committed to the repository to avoid adding generated evidence blobs to source control.

Risk notes

• Spring Boot 4.1.0 is a minor framework update; validation covered compile and integration tests against local Couchbase travel-sample.
• Gradle 9.6.1 is a wrapper/tooling update; no build-script migration was required.
• ravsamhq/notify-slack-action v2 is a CI action dependency update that keeps existing inputs and moves the action runtime to Node 20 after v1 failed in GitHub Actions.
• Existing Dependabot PRs Bump org.springframework.boot from 4.0.6 to 4.1.0 #86 and Bump gradle-wrapper from 9.5.0 to 9.6.1 #88 cover the two Gradle-related version updates, but this Hermes PR was opened per operator instruction to ignore Dependabot PRs and provide validation/evidence.
• No prerelease dependencies were selected.

Rollback

Revert this PR to restore Spring Boot Gradle plugin 4.0.6, Gradle wrapper 9.5.0, and ravsamhq/notify-slack-action@v1.

[gemini-code-assist]

Code Review

This pull request updates the Spring Boot plugin version to 4.1.0 in build.gradle and upgrades the Gradle wrapper to version 9.6.1 in gradle-wrapper.properties. There are no review comments, and I have no additional feedback to provide.

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