feat: fix the e2e test case of the server-info plugin for APISIX v2.13

[Chever-John]

fix the e2e test case of the server-info plugin for APISIX v2.13
#952

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What this PR does / why we need it:

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[codecov-commenter]

Codecov Report

Merging #959 (d43ec24) into master (22cfb5e) will not change coverage.
The diff coverage is n/a.

❗ Current head d43ec24 differs from pull request most recent head e20bee0. Consider uploading reports for the commit e20bee0 to get more accurate results

@@           Coverage Diff           @@
##           master     #959   +/-   ##
=======================================
  Coverage   31.75%   31.75%           
=======================================
  Files          72       72           
  Lines        7935     7935           
=======================================
  Hits         2520     2520           
  Misses       5139     5139           
  Partials      276      276           

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[tao12345666333]

please check the CI jobs error

[tao12345666333]

re-run CI jobs.

[tao12345666333]

LGTM