test: update to new eslint vitest plugin

[matejchalk]

Follow-up from code-pushup/eslint-config#37.

Fixes warning from npm install:

npm warn ERESOLVE overriding peer dependency
npm warn While resolving: @typescript-eslint/utils@7.18.0
npm warn Found: eslint@9.16.0
npm warn node_modules/eslint
npm warn eslint@"^9.16.0" from the root project
npm warn 27 more (@code-pushup/eslint-config, ...)
npm warn
npm warn Could not resolve dependency:
npm warn peer eslint@"^8.56.0" from @typescript-eslint/utils@7.18.0
npm warn node_modules/eslint-plugin-vitest/node_modules/@typescript-eslint/utils
npm warn @typescript-eslint/utils@"^7.7.1" from eslint-plugin-vitest@0.5.4
npm warn node_modules/eslint-plugin-vitest
npm warn
npm warn Conflicting peer dependency: eslint@8.57.1
npm warn node_modules/eslint
npm warn peer eslint@"^8.56.0" from @typescript-eslint/utils@7.18.0
npm warn node_modules/eslint-plugin-vitest/node_modules/@typescript-eslint/utils
npm warn @typescript-eslint/utils@"^7.7.1" from eslint-plugin-vitest@0.5.4
npm warn node_modules/eslint-plugin-vitest

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared current commit bf6c6d1 with previous commit 137392e.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🔴 47	🔴 49
Code coverage	🟢 90	🟢 90
Security	🟡 62	🟡 62	–
Updates	🟡 84	🟡 84	–
Accessibility	🟢 92	🟢 92	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 61	🟡 61	–
Type Safety	🟢 100	🟢 100	–
Bug prevention	🟢 100	🟢 100	–
Miscellaneous	🟢 100	🟢 100	–
Code style	🟢 100	🟢 100	–
Documentation	🔴 23	🔴 23	–

👍 2 groups improved, 👍 6 audits improved, 👎 1 audit regressed, 11 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	Performance	🔴 47	🔴 49
Code coverage	Code coverage metrics	🟢 90	🟢 90

19 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	Initial server response time was short	🟩 Root document took 560 ms	🟥 Root document took 1,800 ms
Lighthouse	Time to Interactive	🟥 15.9 s	🟥 13.1 s
Lighthouse	Speed Index	🟥 8.3 s	🟥 7.7 s
Lighthouse	Largest Contentful Paint	🟨 3.7 s	🟨 3.5 s
Lighthouse	Total Blocking Time	🟥 7,780 ms	🟥 2,900 ms
Lighthouse	First Contentful Paint	🟨 2.9 s	🟨 2.9 s
Code coverage	Line coverage	🟨 89.8 %	🟨 89.8 %
Lighthouse	Minimizes main-thread work	🟥 22.1 s	🟥 13.5 s
Lighthouse	JavaScript execution time	🟥 10.0 s	🟥 6.4 s
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	Max Potential First Input Delay	🟥 3,290 ms	🟥 1,710 ms
Lighthouse	Eliminate render-blocking resources	🟥 Potential savings of 210 ms	🟥 Potential savings of 810 ms
Lighthouse	Uses efficient cache policy on static assets	🟨 27 resources found	🟨 27 resources found
Lighthouse	Avoids enormous network payloads	🟩 Total size was 1,838 KiB	🟩 Total size was 1,838 KiB
Lighthouse	Server Backend Latencies	🟩 260 ms	🟩 220 ms
Lighthouse	Network Round Trip Times	🟩 80 ms	🟩 70 ms
JS Packages	Outdated NPM dev dependencies.	🟨 53 outdated package versions (27 major, 19 minor, 6 patch, 1 prerelease)	🟨 52 outdated package versions (27 major, 18 minor, 6 patch, 1 prerelease)
Lighthouse	Avoids an excessive DOM size	🟥 2,153 elements	🟥 2,152 elements

579 other audits are unchanged.