Fixed Polygon API key authentication URL

[the-praxs]

Description

• Modified the URL to use the 1st day of the current month and year
• Fixes [Bug] Polygon API key test failed for Basic plan keys #4747
• 

How has this been tested?

Checking multiple keys using the command keys\polygon -k <API_KEY>

• Make sure affected commands still run in terminal
• Ensure the SDK still works
• Check any related reports

Checklist:

• I have adhered to the GitFlow naming convention and my branch name is in the format of feature/feature-name or hotfix/hotfix-name.
• Update our documentation following these guidelines. Update any user guides that are affected by the changes.
• Update our tests following these guidelines.
• Make sure you are following our CONTRIBUTING guidelines.
• If a feature was added make sure to add it to the corresponding integration test script.

Others

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.

[the-praxs]

@hjoaquim please tell me where the Linting test is failing.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@2e79308). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #4748   +/-   ##
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  Coverage           ?   57.51%           
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  Files              ?      588           
  Lines              ?    53794           
  Branches           ?        0           
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  Hits               ?    30942           
  Misses             ?    22852           
  Partials           ?        0           

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[colin99d]

@hjoaquim please tell me where the Linting test is failing.

openbb_terminal/keys_model.py:6:1: I001 [*] Import block is un-sorted or un-formatted
Looks like we just need to sort the imports. To fix this run the following:

1. pip install ruff
2. ruff . --fix

Thank you for this PR!

[the-praxs]

@colin99d thank you for the info! Fixed and committed.

[colin99d]

This works for me!