fix(dropdown): auto close after click overlay element

[LEEHONCN]

affects: @gio-design/components, website

Related issue link

Changelog

auto close after click overlay element.
change overlay type from ReactNode to ReactElement.

Language	Changelog
🇺🇸 English	auto close after click overlay element. change overlay type from ReactNode to ReactElement.
🇨🇳 Chinese	点击overlay元素后，自动关闭下拉菜单。将overlay的类型从ReactNode更改为ReactElement

Self check

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

[codecov]

Codecov Report

Merging #252 into master will decrease coverage by 0.00%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master     #252      +/-   ##
==========================================
- Coverage   62.96%   62.96%   -0.01%     
==========================================
  Files          95       95              
  Lines        2762     2770       +8     
  Branches      686      689       +3     
==========================================
+ Hits         1739     1744       +5     
- Misses       1019     1022       +3     
  Partials        4        4              

Impacted Files	Coverage Δ
...ckages/components/src/components/select/Select.tsx	0.00% <0.00%> (ø)
...es/components/src/components/dropdown/Dropdown.tsx	91.66% <75.00%> (-8.34%)	⬇️

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[azure-pipelines]

Deploy preview for ready! ✅ https://deploy-preview-252--gio-design.surge.sh