chore(deps): Update langgraph requirement from >=0.2.55 to >=1.1.9 in /a2a/image_service

[dependabot]

Updates the requirements on langgraph to permit the latest version.

Release notes

Sourced from langgraph's releases.

langgraph==1.1.9

Changes since 1.1.8

• chore(langgraph): bump version 1.1.8 -> 1.1.9 (#7563)
• fix(langgraph): don't propagate ReplayState to subgraphs on plain resume (#7561)
• chore(langgraph): undo unnecessary changes in stream handler (#7536)

Commits

• a529b9b chore(langgraph): bump version 1.1.8 -> 1.1.9 (#7563)
• 0a26b47 fix(langgraph): don't propagate ReplayState to subgraphs on plain resume (#7561)
• b674dd4 feat(prebuilt): expose available tools on ToolRuntime (#7512)
• 8df0a37 chore(langgraph): undo unnecessary changes in stream handler (#7536)
• 216cf33 chore(deps): bump the pip group across 3 directories with 1 update (#7537)
• 4956134 release(langgraph): 1.1.8 (#7545)
• aa94790 fix(langgraph): remove strict add_handler type check that breaks OTel instrum...
• e002711 release(prebuilt): 1.0.10 (#7541)
• f44b49b chore: dedup warnings (#7257)
• a0a95df release(cli): 0.4.23 (#7542)
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[pdettori]

Closing: major version bump (langgraph 0.2.55 → 1.1.9). This is a breaking change that requires manual validation of the image_service agent. The langgraph 1.x release has significant API changes. Please review changelog and test locally before upgrading.

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