Update for release 1.9.1 (#1622)

<!-- Contributing guide:
https://github.com/openvinotoolkit/datumaro/blob/develop/CONTRIBUTING.md
-->

### Summary

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Resolves #111 and #222.
Depends on #1000 (for series of dependent commits).

This PR introduces this capability to make the project better in this
and that.

- Added this feature
- Removed that feature
- Fixed the problem #1234
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### How to test
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### Checklist
<!-- Put an 'x' in all the boxes that apply -->
- [ ] I have added unit tests to cover my changes.​
- [ ] I have added integration tests to cover my changes.​
- [ ] I have added the description of my changes into
[CHANGELOG](https://github.com/openvinotoolkit/datumaro/blob/develop/CHANGELOG.md).​
- [ ] I have updated the
[documentation](https://github.com/openvinotoolkit/datumaro/tree/develop/docs)
accordingly

### License

- [ ] I submit _my code changes_ under the same [MIT
License](https://github.com/openvinotoolkit/datumaro/blob/develop/LICENSE)
that covers the project.
  Feel free to contact the maintainers if that's a concern.
- [ ] I have updated the license header for each file (see an example
below).

```python
# Copyright (C) 2024 Intel Corporation
#
# SPDX-License-Identifier: MIT
```

Author: yunchu

CHANGELOG.md

@@ -6,8 +6,6 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## \[Q4 2024 Release 1.9.1\]
-### New features
-
 ### Enhancements
 - Support multiple labels for kaggle format
   (<https://github.com/openvinotoolkit/datumaro/pull/1607>)

docs/source/docs/release_notes.rst

@@ -4,6 +4,18 @@ Release Notes
 .. toctree::
    :maxdepth: 1
 
+v1.9.1 (2024 Q3)
+----------------
+
+Enhancements
+^^^^^^^^^^^^
+- Support multiple labels for kaggle format
+- Use DataFrame.map instead of DataFrame.applymap
+
+Bug fixes
+^^^^^^^^^
+- Fix StreamDataset merging when importing in eager mode
+
 v1.9.0 (2024 Q3)
 ----------------
 

src/datumaro/version.py

@@ -1 +1 @@
-__version__ = "1.9.1rc0"
+__version__ = "1.9.1"