fix(module:space): fix deprecated warning for nz-space-item (#6549)

[lsbbd]

closes #6549

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: #6549

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #6561 (4f24e54) into master (bc0e468) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 4f24e54 differs from pull request most recent head e313656. Consider uploading reports for the commit e313656 to get more accurate results

@@            Coverage Diff             @@
##           master    #6561      +/-   ##
==========================================
- Coverage   89.88%   89.87%   -0.01%     
==========================================
  Files         481      481              
  Lines       15374    15374              
  Branches     2343     2486     +143     
==========================================
- Hits        13819    13818       -1     
  Misses        937      937              
- Partials      618      619       +1     

Impacted Files	Coverage Δ
components/space/space.component.ts	100.00% <100.00%> (ø)
components/time-picker/time-holder.ts	94.73% <0.00%> (-1.06%)	⬇️
components/tabs/tab-nav-bar.component.ts	82.39% <0.00%> (-0.71%)	⬇️
components/core/util/text-measure.ts	91.30% <0.00%> (+1.73%)	⬆️

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