Bump langgraph-checkpoint from 3.0.1 to 4.0.0 in /backend

[dependabot]

Bumps langgraph-checkpoint from 3.0.1 to 4.0.0.

Release notes

Sourced from langgraph-checkpoint's releases.

langgraph-checkpoint==4.0.0

Changes since checkpoint==3.0.1

• fix: flip default on base cache (#6677)
• fix(checkpoint): InMemorySaver context managers should return self in… (#6529)
• fix: docstring for serializer protocol (#6525)
• chore: clean up some refs (#6487)
• chore: add pyproject.toml links (#6364)

langgraph-checkpoint-postgres==3.0.4

Changes since checkpointpostgres==3.0.3

• chore: Omit lock when using connection pool (#6734)
• chore(deps): upgrade dependencies with uv lock --upgrade (#6671)
• chore: update twitter URLs (#6683)

langgraph-checkpoint-postgres==3.0.3

Changes since checkpointpostgres==3.0.2

• fix: flip default on base cache (#6677)
• docs: storage nits (#6651)

langgraph-checkpoint-sqlite==3.0.3

Changes since checkpointsqlite==3.0.2

• fix: aiosqlite's breaking change (#6699)
• chore(deps): upgrade dependencies with uv lock --upgrade (#6671)
• chore: update twitter URLs (#6683)

langgraph-checkpoint-postgres==3.0.2

Changes since checkpointpostgres==3.0.1

• release(checkpoint-postgres): 3.0.1 (#6568)
• chore: pgqs (#6567)
• fix(checkpoint-postgres): ensure vector extension is created only if not exists (#6154)
• fix(checkpoint-postgres): Replace f-string SQL formatting with parameterized queries in migration statements (#6328)
• chore: add pyproject.toml links (#6364)
• docs: add license files for checkpoint-sqlite and checkpoint-postgres (#6392)

langgraph-checkpoint-sqlite==3.0.2

Changes since checkpointsqlite==3.0.1

• fix: flip default on base cache (#6677)
• docs: storage nits (#6651)

Commits

• f91d79d fix: flip default on base cache (#6677)
• cb2faa7 fix(prebuilt): support generic type arguments for ToolRuntime injection (#6509)
• a5827c5 fix: change default recursion limit (#6676)
• 5212369 feat(sdk-py): add end-time to crons client (#6674)
• 7045a23 fix: add state attribute to ToolCallRequest overrides (#6668)
• 728db10 fix: suppress unintended deprecation warning (#6669)
• 454af21 feat(sdk-py): cron.on_run_completed support (#6662)
• b4630d8 chore: delete docs (#6488)
• 311465b fix: sanitize namespace for deeply nested graph jumps (#6665)
• 8ccead9 docs: x-refs and explainer in tool node docs (#6653)
• Additional commits viewable in compare view

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.71%. Comparing base (e9f657a) to head (c146547).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #277      +/-   ##
==========================================
+ Coverage   83.68%   83.71%   +0.03%     
==========================================
  Files         143      143              
  Lines       13543    13543              
==========================================
+ Hits        11333    11338       +5     
+ Misses       2210     2205       -5     

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