update: optimize collation check of utf8mb3

[hanchuanchuan]

fixed #641

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 58.7194%. Comparing base (02acf74) to head (88376f9). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #643 +/- ## ================================================ + Coverage 58.7169% 58.7194% +0.0024% ================================================ Files 377 377 Lines 90020 90023 +3 ================================================ + Hits 52857 52861 +4 + Misses 32513 32511 -2 - Partials 4650 4651 +1 ```