Fix stable/8.7 CI

[megglos]

Description

This fixes the currently broken stable/8.7 CI, by:

• Backport of ci: bump protobuf to 4.29.3 to align with camunda/camunda #1421.
• Alignment of spring boot version with camunda/camunda stable/8.7.
• Removal of explicit management of httpcore, to be inherited from the camunda/camunda deps instead. (Otherwise test runtime issues occurred)
• Removal of explicit spring-core dependency, to use version managed by spring-boot bom. (Otherwise test runtime issues occurred)

[github-actions]

Test Results

 50 files  ±0   50 suites  ±0   1m 38s ⏱️ +7s
138 tests ±0  138 ✅ ±0  0 💤 ±0  0 ❌ ±0 
438 runs  ±0  438 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 6678c47. ± Comparison against base commit fdda8c2.

♻️ This comment has been updated with latest results.

[megglos]

this conflicted with camunda/camunda already being on a new minor release of http core. I decided to remove it as there is no convergence issue anymore.

[megglos]

tagging @rodrigo-lourenco-lopes as release manager, this should have been blocking the latest alpha release too, right?

[rodrigo-lourenco-lopes]

tagging @rodrigo-lourenco-lopes as release manager, this should have been blocking the latest alpha release too, right?

@megglos I was not aware of this issue, should this have been in the alpha release?

[saig0]

👍

[megglos]

tagging @rodrigo-lourenco-lopes as release manager, this should have been blocking the latest alpha release too, right?

@megglos I was not aware of this issue, should this have been in the alpha release?

if the alpha release build was still fine, no, this seems to have been caused by recent renovate updates on the mono-repo