Bump langgraph from 0.3.18 to 0.3.21

[dependabot]

Bumps langgraph from 0.3.18 to 0.3.21.

Release notes

Sourced from langgraph's releases.

0.3.21

Changes since 0.3.20

• langgraph: release 0.3.21 (#4050)
• langgraph: add tests for remote graph interrupts (#4048)
• patch: fix return type of Topic.update (#4029)
• benchmark: remove some benchmarks (#4039)
• langgraph: fix interrupt deserialization in RemoteGraph (#4040)
• x
• docs: add version admonitions for Interrupt and RetryPolicy (#3988)
• Warn when get_graph tries to draw edge that doesn't exist

0.3.20

Changes since 0.3.19

• 0.3.20
• Use 128bit hash for task ids
• Log and continue for subgraph schema issues (#3997)
• Switch serialization lib to ormsgpack (#3953)

0.3.19

Changes since 0.3.18

• 0.3.19
• Switch task ids to use xxhash3 (#3954)
• prebuilt: release 0.1.4 (#3977)
• Use incremental storage in memory checkpointer (#3960)
• docs: use hosted logo (#3959)
• Include enum in check for pydantic state (#3955)
• benchmark: Add compilation only (#3932)
• Include enum in check for pydantic state
• Use fast path for prepare_next_tasks on input (#3931)
• More small perf improvements
• Use fast path for prepare_next_tasks on input
• langgraph: incorporate information about previously updated channels to identify which tasks to execute next (#3916)
• Add refcount test (#3910)

Commits

• 2c29eda langgraph: release 0.3.21 (#4050)
• 96847e6 langgraph: add tests for remote graph interrupts (#4048)
• 7021ce3 patch: fix return type of Topic.update (#4029)
• d0c0aa9 benchmark: remove some benchmarks (#4039)
• 520de30 langgraph: fix interrupt deserialization in RemoteGraph (#4040)
• 81c0d47 x
• 87603d8 docs: add version admonitions for Interrupt and RetryPolicy (#3988)
• 7ad7329 docs: add codeact prebuilt (#4036)
• e981d27 prebuilt: release 0.1.7 (#4034)
• 71db4f2 prebuilt: ignore updates when combining parent commands with Send (#4033)
• Additional commits viewable in compare view

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[dependabot]

Looks like langgraph is up-to-date now, so this is no longer needed.