fix mongodb tops module for pymongo v4 compatibility

[smartcoder0777]

Fixes: #68659

What does this PR do?

Fixes the mongodb tops module to work with pymongo v4+ by replacing the deprecated mdb.authenticate() method with authentication credentials passed directly to the MongoClient constructor.

What issues does this PR fix or reference?

Fixes #68659

Previous Behavior

The mongodb tops module used the deprecated mdb.authenticate(user, password) method which was removed in pymongo v4. This caused authentication failures when using pymongo v4.9+ (required for MongoDB v8 compatibility).

conn = pymongo.MongoClient(host=host, port=port, ssl=ssl)
mdb = conn[database]
if user and password:
    mdb.authenticate(user, password)  # ❌ Removed in pymongo v4

New Behavior

Authentication credentials are now passed directly to MongoClient constructor using username, password, and authSource parameters, making it compatible with both pymongo v3 and v4+.

conn_kwargs = {"host": host, "port": port, "ssl": ssl}
if user and password:
    conn_kwargs["username"] = user
    conn_kwargs["password"] = password
    conn_kwargs["authSource"] = authdb  # Defaults to "admin"
conn = pymongo.MongoClient(**conn_kwargs)

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• [x ] Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• [x ] Tests written/updated

Commits signed with GPG?

Yes

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