Bump Spring Boot 4 to M2

[adinauer]

#skip-changelog

📜 Description

Spring Boot 4 M2 has been released, this PR bumps our used version and fixes some problems that showed up.

We should try to replace the explicit dependency version pin.

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[adinauer]

• Bump Spring Boot 4 to M2 #4665 👈 (View in Graphite)
• main

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	383.34 ms	455.67 ms	72.33 ms
Size	1.58 MiB	2.10 MiB	533.45 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
ee747ae	358.21 ms	389.41 ms	31.20 ms
ee747ae	396.82 ms	441.67 ms	44.86 ms
ee747ae	405.43 ms	485.70 ms	80.28 ms
ee747ae	400.46 ms	423.61 ms	23.15 ms
ee747ae	357.79 ms	421.84 ms	64.05 ms
ee747ae	415.92 ms	470.15 ms	54.23 ms
ee747ae	374.71 ms	455.18 ms	80.47 ms
ee747ae	554.98 ms	611.50 ms	56.52 ms
ee747ae	386.94 ms	431.43 ms	44.49 ms
674d437	355.28 ms	504.18 ms	148.90 ms

App size

Revision	Plain	With Sentry	Diff
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
674d437	1.58 MiB	2.10 MiB	530.94 KiB

Previous results on branch: 08-26-bump_spring_boot_4_to_m2

Startup times

Revision	Plain	With Sentry	Diff
a7d0c12	369.38 ms	451.10 ms	81.73 ms

App size

Revision	Plain	With Sentry	Diff
a7d0c12	1.58 MiB	2.10 MiB	533.45 KiB