deps: bump pymongo from 4.13.1 to 4.15.0 in /backend

[dependabot]

Bumps pymongo from 4.13.1 to 4.15.0.

Release notes

Sourced from pymongo's releases.

PyMongo 4.15.0

Community notes: https://www.mongodb.com/community/forums/t/pymongo-4-15-released/328574

PyMongo 4.14.1

Community notes: https://www.mongodb.com/community/forums/t/pymongo-4-14-1-released/327511

PyMongo 4.14.0

Community notes: https://www.mongodb.com/community/forums/t/pymongo-4-14-released/326906

PyMongo 4.13.2

Community notes: https://www.mongodb.com/community/forums/t/pymongo-4-13-2-released/323705

Changelog

Sourced from pymongo's changelog.

Changes in Version 4.15.0 (2025/09/10)

PyMongo 4.15 brings a number of changes including:

• Added :class:~pymongo.encryption_options.TextOpts, :attr:~pymongo.encryption.Algorithm.TEXTPREVIEW, :attr:~pymongo.encryption.QueryType.PREFIXPREVIEW, :attr:~pymongo.encryption.QueryType.SUFFIXPREVIEW, :attr:~pymongo.encryption.QueryType.SUBSTRINGPREVIEW, as part of the experimental Queryable Encryption text queries beta. pymongocrypt>=1.16 is required for text query support.
• Added :class:bson.decimal128.DecimalEncoder and :class:bson.decimal128.DecimalDecoder to support encoding and decoding of BSON Decimal128 values to decimal.Decimal values using the TypeRegistry API.
• Added support for Windows arm64 wheels.

Changes in Version 4.14.1 (2025/08/19)

Version 4.14.1 is a bug fix release.

• Fixed a bug in MongoClient.append_metadata() and AsyncMongoClient.append_metadata() that allowed duplicate DriverInfo.name to be appended to the metadata.

Issues Resolved ...............

See the PyMongo 4.14.1 release notes in JIRA_ for the list of resolved issues in this release.

.. _PyMongo 4.14.1 release notes in JIRA: https://jira.mongodb.org/secure/ReleaseNote.jspa?projectId=10004&version=45256

Changes in Version 4.14.0 (2025/08/06)

.. warning:: PyMongo 4.14 drops support for MongoDB 4.0. PyMongo now supports MongoDB 4.2+.

PyMongo 4.14 brings a number of changes including:

• Dropped support for MongoDB 4.0.

• Added preliminary support for Python 3.14 and 3.14 with free-threading. We do not yet support the following with Python 3.14:

  • Subinterpreters (concurrent.interpreters)
  • Free-threading with Encryption
  • mod_wsgi

• Removed experimental support for free-threading support in Python 3.13.

• Added :attr:bson.codec_options.TypeRegistry.codecs and

... (truncated)

Commits

• 1514e9b Prepare 4.15 release (#2523)
• 98e9f5e PYTHON-5538 Clean up uv lock file handling (#2522)
• d7316af PYTHON-5328 CRUD Support in Driver for Prefix/Suffix/Substring Indexes (#2521)
• 7580309 PYTHON-4928 Convert CSFLE spec tests to unified test format (#2520)
• 47c5460 Bump pyright from 1.1.404 to 1.1.405 (#2518)
• b84e1a7 PYTHON-5527 - Unified test typo in 'Expected error' (#2517)
• c0e0554 PYTHON-5521 - Update TestBsonSizeBatches.test_06_insert_fails_over_16MiB erro...
• d63edf7 PYTHON-5524 - Fix CSFLE spec test min version checks (#2516)
• b756bbd Bump the actions group with 2 updates (#2513)
• b2bba67 Update coverage requirement from <=7.10.5,>=5 to >=5,<=7.10.6 (#2512)
• Additional commits viewable in compare view

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Superseded by #172.