add csp nonce attribute to style tags (#20309)

[nzwz]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	#20309
What attribute should be added to the style tag?

Only the nonce
Nonce use-case is easy to find in the API docs
Less flexible

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.15%. Comparing base (7565d33) to head (d45a4b5).

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #20310      +/-   ##
============================================
- Coverage     64.84%   60.15%   -4.70%     
- Complexity    11433    11435       +2     
============================================
  Files           431      431              
  Lines         37190    37192       +2     
============================================
- Hits          24117    22373    -1744     
- Misses        13073    14819    +1746     

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[samdark]

👍 Need a line for CHANGELOG.

[nzwz]

👍 Need a line for CHANGELOG.

Thanks @samdark.

• Add custom attributes support to style tags.

[samdark]

@nzwz I've meant adding the line to https://github.com/yiisoft/yii2/blob/master/framework/CHANGELOG.md

[nzwz]

@samdark CHANGELOG updated, thanks.

[samdark]

Thank you!