chore(deps): update camunda/zeebe docker tag to v8.6.8

[renovate]

This PR contains the following updates:

Package	Update	Change
camunda/zeebe (source)	patch	8.6.7 -> 8.6.8

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Release Notes

camunda/camunda (camunda/zeebe)

v8.6.8

Compare Source

version:8.6.8

Bug Fixes

Misc

• CustomHeaders exposes values as indexable fields (#​27022)
• Tasklist archiver doesn't handle process instances when using Opensearch (#​26576)
• Variable can't be found in UI after process migration (#​26490)
• Non-Prometheus Micrometer implementations only expose few C8 metrics (#​26078)
• UnsupportedOperationException: Incorrect usage of actor.call(...) cannot be called from current actor. (#​25897)
• [CPT] hasCompletedElements() throws an IllegalStateException: Duplicate key null (#​25355)

Maintenance

• [FEEL] Store duration values in a normalized format (#​27098)

Merged Pull Requests

• refactor: return cmd settings in its own function (#​27569)
• refactor: move getBaseCommand in own function (#​27568)
• refactor: move set envVars in single function (#​27566)
• Drop usage of old Prometheus simple client for benchmarks module (#​27493)
• pg-27022-schema-validator-dynamic-field (#​27483)
• refactor: remove tasklist-list-view index (#​27293)
• fix: Store duration values in a normalized format (#​27161)
• ci: make sure also GHA *.yaml files are linted (#​27010)
• fix: ignore MIGRATED variable records (#​26914)
• fix: avoid actor call to unregister handlers when it is closing (#​26759)
• ci: add backport label when touching the deprecated java client in 8.6 (#​26742)
• fix: @​TestZeebe resources are closed even when constructed in a @​BeforeEach (#​26737)
• Replace usage of internal Junit 5 helper removed in Junit 5.11 (#​26722)
• ci: fix CAMUNDA_OPERATE_TASKLIST_URL parameter used in docker-compose (#​26643)
• fix 19883 bug on REST connection pooling (#​26317)
• [CPT] fix: Element assertion can handle BPMN elements with the same name (#​26234)
• fix: handle RawApiEntityConsumer buffer size correctly (#​24781)
• [Backport stable/1.2] Fixes flakiness with the ElasticsearchExporter integration tests (#​8203)

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Test Results

37 tests   35 ✅  20s ⏱️
 9 suites   2 💤
 9 files     0 ❌

Results for commit 1fb1802.

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