Bump litellm from 1.85.0 to 1.88.6

[dependabot]

Bumps litellm from 1.85.0 to 1.88.6.

Release notes

Sourced from litellm's releases.

v1.88.6

Verify Docker Image Signature

All LiteLLM Docker images are signed with cosign. Every release is signed with the same key introduced in commit 0112e53.

Verify using the pinned commit hash (recommended):

A commit hash is cryptographically immutable, so this is the strongest way to ensure you are using the original signing key:

cosign verify \
  --key https://raw.githubusercontent.com/BerriAI/litellm/0112e53046018d726492c814b3644b7d376029d0/cosign.pub \
  ghcr.io/berriai/litellm:v1.88.6

Verify using the release tag (convenience):

Tags are protected in this repository and resolve to the same key. This option is easier to read but relies on tag protection rules:

cosign verify \
  --key https://raw.githubusercontent.com/BerriAI/litellm/v1.88.6/cosign.pub \
  ghcr.io/berriai/litellm:v1.88.6

Expected output:

The following checks were performed on each of these signatures:
  - The cosign claims were validated
  - The signatures were verified against the specified public key

---

What's Changed

• chore(release): backport proxy request-handling fixes and refresh runtime deps for 1.88.6 by @​yuneng-berri in BerriAI/litellm#36314

Full Changelog: BerriAI/litellm@v1.88.5...v1.88.6

Commits

• b504a0e Merge pull request #36314 from BerriAI/litellm_backport_1_88_x_bp-188x-0807sec
• e96c272 fix(deps): raise aiohttp floor to 3.14.2 to clear pooled-connection timeouts
• eadbcc7 build(deps): update ddtrace to the 4.x line
• 49ea7fa chore(deps): bump setuptools to 83.0.0
• ba818e2 chore(deps): bump langgraph-checkpoint to 4.1.1
• 262448e chore(deps): bump h2 to 4.4.1
• 5af1b16 chore(deps): bump langsmith to 0.8.18
• 51f17d7 chore(deps): bump httplib2 to 0.32.0
• f9b2839 chore(deps): bump soupsieve to 2.8.4
• d3317f2 chore(deps): bump gitpython to 3.1.58
• Additional commits viewable in compare view