chore(deps): update litellm requirement from <2,>=1.90.2 to >=1.91.1,<2

[dependabot]

Updates the requirements on litellm to permit the latest version.

Release notes

Sourced from litellm's releases.

v1.91.1

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:v1.91.1

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/v1.91.1/cosign.pub \
  ghcr.io/berriai/litellm:v1.91.1

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

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What's Changed

• chore(release): backport #32256, #32405, #32524 to stable/1.91.x and cut 1.91.1 by @​yuneng-berri in BerriAI/litellm#32552

Full Changelog: BerriAI/litellm@v1.91.0...v1.91.1

Commits

• cdc8c72 Merge pull request #32552 from BerriAI/litellm_backport_1_91_x_0708
• 8fb1667 chore: refresh uv.lock for 1.91.1
• f2bc532 bump: version 1.91.0 → 1.91.1
• d5d6e87 fix(otel): restore error.* span attributes on v2 error spans (LIT-4179) (#32524)
• 272c0f8 Merge pull request #32405 from BerriAI/litellm_kraken-remove-envref-gates
• fec5076 Merge pull request #32256 from BerriAI/litellm_bedrock_db_env_expansion
• 0519dbf Merge pull request #32100 from BerriAI/litellm_backport_32032_191rc1
• fb40860 revert: undo teamless all-team-models denial from #32022 and #29746 (#32032)
• 7590e7f Merge pull request #32094 from BerriAI/litellm_ui_rebuild_191rc1
• 9bee45f chore: update Next.js build artifacts (2026-07-04 01:07 UTC, node v20.20.2)
• Additional commits viewable in compare view

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