Prep 0.7.1 release of langchain-mongodb (#234)

[Issue Key](https://jira.mongodb.org/browse/{ISSUE_KEY})

## Summary

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Follows `Prep the Release` step in `RELEASE.md`

## Changes in this PR

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private) were added, removed, or edited to generate the desired outcome
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Bump patch version and update changelog.

## Test Plan

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Reran existing tests.

### Screenshots (optional)

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## Checklist

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### Checklist for Author

- [x] Did you update the changelog (if necessary)?
- [ ] Is the intention of the code captured in relevant tests?
- [ ] If there are new TODOs, has a related JIRA ticket been created?
- [ ] Has a MongoDB Employee run [the patch build of this
PR](https://github.com/mongodb-labs/ai-ml-pipeline-testing?tab=readme-ov-file#running-a-patch-build-of-a-given-pr)?

### Checklist for Reviewer {@primary_reviewer}

- [ ] Does the title of the PR reference a JIRA Ticket?
- [x] Do you fully understand the implementation? (Would you be
comfortable explaining how this code works to someone else?)
- [x] Have you checked for spelling & grammar errors?
- [x] Is all relevant documentation (README or docstring) updated?

## Focus Areas for Reviewer (optional)

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Author: caseyclements

libs/langchain-mongodb/CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ---
 
+## Changes in version 0.7.1 (2025/10/13)
+
+- Only list authorized collections when listing collections.
+- In retrievers that require it (e.g. hybrid, full-text), warn when no documents have a text_key.
+
 ## Changes in version 0.7.0 (2025/08/19)
 
 - Support separate weights in hybrid retriever.

libs/langchain-mongodb/pyproject.toml

@@ -5,7 +5,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langchain-mongodb"
-version = "0.7.0"
+version = "0.7.1"
 description = "An integration package connecting MongoDB and LangChain"
 readme = "README.md"
 requires-python = ">=3.9"