ci(python): update litellm requirement from <=1.83.13,>=1.75.9 to >=1.75.9,<=1.86.2 in /strands-py

[dependabot]

Updates the requirements on litellm to permit the latest version.

Release notes

Sourced from litellm's releases.

v1.86.2

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:v1.86.2

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/v1.86.2/cosign.pub \
  ghcr.io/berriai/litellm:v1.86.2

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(proxy): cherry-pick #28547 onto patch/v1.86.1 by @​yuneng-berri in BerriAI/litellm#28969
• chore: uv lock for 1.86.2 by @​yuneng-berri in BerriAI/litellm#28972

Full Changelog: BerriAI/litellm@v1.86.1...v1.86.2

Commits

• 72fdccb chore: uv lock for 1.86.2 (#28972)
• be557c8 chore(proxy): cherry-pick #28547 onto patch/v1.86.1 (#28969)
• a8caf28 chore(release): 1.86.1 (#28823)
• a13cd21 Merge pull request #28744 from BerriAI/litellm_/bold-lumiere-b74316
• 9e7192e fix(docker): restore npm to non_root builder image (#28519)
• a72414a Merge pull request #28100 from BerriAI/litellm_internal_staging
• cf9b5e4 [Infra] Bump versions (#28094)
• 1b0ae3a fix(mcp-oauth): PROXY_BASE_URL escape hatch + diagnostic logging for {"detail...
• 3d5a9ed feat: add Terraform stacks for deploying LiteLLM on AWS and GCP (#27673)
• fbe0ee8 fix(proxy): sort BYOK models by their displayed name in /v2/model/info (#28079)
• Additional commits viewable in compare view

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