v1.100.1

## Verify Docker Image Signature

All LiteLLM Docker images are signed with [cosign](https://docs.sigstore.dev/cosign/overview/). Every release is signed with the same key introduced in [commit `0112e53`](https://github.com/BerriAI/litellm/commit/0112e53046018d726492c814b3644b7d376029d0).

**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:

```bash
cosign verify \
  --key https://raw.githubusercontent.com/BerriAI/litellm/0112e53046018d726492c814b3644b7d376029d0/cosign.pub \
  ghcr.io/berriai/litellm:v1.100.1
```

**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:

```bash
cosign verify \
  --key https://raw.githubusercontent.com/BerriAI/litellm/v1.100.1/cosign.pub \
  ghcr.io/berriai/litellm:v1.100.1
```

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
```

---
## What's Changed
* chore(release): backport #39568 and #39572 to stable/1.100.x and cut 1.100.1 by @devin-ai-integration[bot] in https://github.com/BerriAI/litellm/pull/40176
* fix(router): backport #39491 to stable/1.100.x so retry breadcrumbs stop retaining every earlier request by @devin-ai-integration[bot] in https://github.com/BerriAI/litellm/pull/40455
* revert: drop the spend attribution backports from stable/1.100.x by @devin-ai-integration[bot] in https://github.com/BerriAI/litellm/pull/40495


**Full Changelog**: https://github.com/BerriAI/litellm/compare/v1.100.0...v1.100.1