fix test as signature length should not be compared

[fuxingloh]

What kind of PR is this?:

/kind fix

What this PR does / why we need it:

1. 30440220
2. 30430220

DER signature length should not be compared in the test as it's a variable number.

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
packages/jellyfish/dist/jellyfish.umd.js	18.87 KB (0%)	378 ms (0%)	185 ms (+6.08% 🔺)	562 ms

[codecov]

Codecov Report

Merging #178 (2fd7be5) into main (a969279) will decrease coverage by 0.40%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
- Coverage   95.50%   95.10%   -0.41%     
==========================================
  Files          56       56              
  Lines        1180     1185       +5     
  Branches      149      150       +1     
==========================================
  Hits         1127     1127              
- Misses         50       55       +5     
  Partials        3        3              

Impacted Files	Coverage Δ
packages/testcontainers/src/chains/container.ts	84.54% <100.00%> (-4.03%)	⬇️

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