feat(spring): add Spring Boot 4 / Spring Framework 7 support to spring-webflux-6.0

[wconti27]

🤖 Generated with APM Instrumentation Toolkit

Summary

• Bumps latestDepTestImplementation spring-webflux from 6.+ to 7.+ for Spring Framework 7 test coverage
• Bumps latestDepTestImplementation spring-context/spring-test from 6.+ to 7.+
• Bumps latestDepBootTestImplementation spring-boot-starter-* from 3.+ to 4.+ for Spring Boot 4 test coverage
• Updates testJvmConstraints { minJavaVersion } from VERSION_17 to VERSION_21 (Spring Framework 7.0 requires Java 21)
• Verified: existing DispatcherHandler, HandlerAdapter, and RouterFunction hooks are confirmed stable in SF7 — no instrumentation code changes needed

Test plan

• compileJava — BUILD SUCCESSFUL
• spotlessApply — clean
• latestDepTest against spring-webflux:7.+ and spring-boot-starter-*:4.+ (CI)

Related

Part of Spring Boot 4 instrumentation: https://github.com/DataDog/apm-instrumentation-toolkit/issues/437
Depends on: #11584 (jakarta-servlet-6.0)

[datadog-datadog-prod-us1]

✨ Fix all issues with BitsAI

⚠️ Warnings

🚦 3 Pipeline jobs failed

DataDog/apm-reliability/dd-trace-java | test_inst_latest: [21, 6/6]     

DataDog/apm-reliability/dd-trace-java | test_inst_latest: [25, 6/6]     

Run system tests | main / End-to-end #6 / jersey-grizzly2 6     

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[dd-octo-sts]

🟢 Java Benchmark SLOs — All performance SLOs passed

Suite	Status
Startup	🟢 pass

SLO thresholds are defined here based on automatically generated metrics. A warning is raised when results are within 5% of the threshold.

PR vs. master results

Scenario	Candidate	master	Δ (95% CI of mean)
startup:insecure-bank:iast:Agent	13.97 s	13.93 s	[-0.9%; +1.4%] (no difference)
startup:insecure-bank:tracing:Agent	12.96 s	13.10 s	[-2.3%; +0.2%] (no difference)
startup:petclinic:appsec:Agent	16.44 s	16.23 s	[+0.1%; +2.6%] (maybe worse)
startup:petclinic:iast:Agent	16.47 s	16.55 s	[-1.6%; +0.7%] (no difference)
startup:petclinic:profiling:Agent	16.56 s	16.34 s	[+0.2%; +2.5%] (maybe worse)
startup:petclinic:tracing:Agent	14.75 s	15.78 s	[-14.5%; +1.4%] (unstable)

Commit: 77a38755 · CI Pipeline · Benchmarking Platform UI

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Load and DaCapo benchmarks can be triggered manually in the GitLab pipeline. Results will appear in the Benchmarking Platform UI after completion.