add target to .NET 7

[ElderJames]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• Bundle size optimization
• Performance optimization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English
🇨🇳 Chinese

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Changelog is provided or not needed

[github-actions]

[codecov]

Codecov Report

Base: 44.60% // Head: 44.67% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (dce3af2) compared to base (6760a41).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2810      +/-   ##
==========================================
+ Coverage   44.60%   44.67%   +0.06%     
==========================================
  Files         545      545              
  Lines       25779    25779              
  Branches      261      261              
==========================================
+ Hits        11500    11517      +17     
+ Misses      14239    14222      -17     
  Partials       40       40              

Impacted Files	Coverage Δ
components/table/Table.razor.cs	0.00% <ø> (ø)
components/date-picker/locale/DatePickerLocale.cs	100.00% <0.00%> (+3.22%)	⬆️
components/drawer/Drawer.razor.cs	93.46% <0.00%> (+3.26%)	⬆️
components/locale-provider/LocaleProvider.cs	66.66% <0.00%> (+12.82%)	⬆️

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