Deprecations: fix version number for get_page_by_path()

[GaryJones]

Description

The WordPress core function get_page_by_path() had caching added in WP 4.6.0 via https://core.trac.wordpress.org/ticket/36711.

The confusing bit is that the effort to make the function use WP_Query (adds priming of caches) internally is the bit that was tried and reverted in https://core.trac.wordpress.org/ticket/56689#comment:19 for WP 6.1.

See #5224.

Changelog Description

Fixed

• Deprecations: fix the WP version number for the deprecation of wpcom_vip_get_page_by_path() to use get_page_by_path().

Pre-review checklist

Please make sure the items below have been covered before requesting a review:

• This change works and has been tested locally or in Codespaces (or has an appropriate fallback).
• This change works and has been tested on a sandbox.
• This change has relevant unit tests (if applicable).
• This change uses a rollout method to ease with deployment (if applicable - especially for large scale actions that require writes).
• This change has relevant documentation additions / updates (if applicable).
• I've created a changelog description that aligns with the provided examples.

Pre-deploy checklist

• VIP staff: Ensure any alerts added/updated conform to internal standards (see internal documentation).

Steps to Test

No testing is needed as there is no functional change—the correct WordPress version number is now being used in deprecated function calls and documentation to avoid confusion.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 29.66%. Comparing base (f18c1d1) to head (6a2d2a9).
Report is 33 commits behind head on develop.

Files with missing lines	Patch %	Lines
vip-helpers/vip-deprecated.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #5868      +/-   ##
=============================================
+ Coverage      29.64%   29.66%   +0.01%     
  Complexity      4760     4760              
=============================================
  Files            281      281              
  Lines          20534    20522      -12     
=============================================
  Hits            6087     6087              
+ Misses         14447    14435      -12     

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