Prep for v1.7.1

[andystaples]

As stated

[Copilot]

Pull request overview

Prepares the Durable Task Python SDK (durabletask) and its Azure Managed provider (durabletask.azuremanaged) for the v1.7.1 release by bumping package versions, aligning inter-package dependency constraints, and rolling the changelogs forward to a v1.7.1 section.

Changes:

• Bumped durabletask version to 1.7.1.
• Bumped durabletask.azuremanaged version to 1.7.1 and updated its durabletask dependency constraints to >=1.7.1 (including the azure-blob-payloads extra).
• Added v1.7.1 sections to both changelogs to reflect the release.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Bumps core package version to 1.7.1.
durabletask-azuremanaged/pyproject.toml	Bumps provider version and updates core SDK dependency minimums to 1.7.1.
CHANGELOG.md	Adds v1.7.1 release section for the core SDK.
durabletask-azuremanaged/CHANGELOG.md	Adds v1.7.1 release section noting the dependency alignment.