Drop WP 5.5 checks in VIP Mail

[sjinks]

Description

Drop WP 5.5 checks in VIP Mail because we don't support WordPress versions older than 5.7 anyway.

Changelog Description

Plugin Updated: VIP Mail

Drop support for WordPress older than 5.5.

Checklist

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

• [ ] This change works and has been tested locally (or has an appropriate fallback).
• [ ] This change works and has been tested on a Go sandbox.
• [x] This change has relevant unit tests (if applicable).
• [ ] This change has relevant documentation additions / updates (if applicable).
• [x] I've created a changelog description that aligns with the provided examples.

Steps to Test

The CI should pass.

[codecov[bot]]

Codecov Report

Merging #3527 (42ceb5a) into develop (d7b4c55) will increase coverage by 0.00%. The diff coverage is 0.00%.

:exclamation: Current head 42ceb5a differs from pull request most recent head 9f51e1a. Consider uploading reports for the commit 9f51e1a to get more accurate results

@@            Coverage Diff             @@
##             develop    #3527   +/-   ##
==========================================
  Coverage      34.01%   34.01%           
  Complexity      3549     3549           
==========================================
  Files            217      217           
  Lines          13887    13886    -1     
==========================================
  Hits            4723     4723           
+ Misses          9164     9163    -1     

Impacted Files	Coverage Δ
vip-mail.php	64.78% <0.00%> (+0.89%)	:arrow_up:

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[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication