[chore]: Update prettier

[emilyhernandez]

DS-661

Updated Prettier, since v3.8.2 added support for Angular v21.2 which is what Fudis is soon transitioning to (#926 ).

Developer's checklist

• I wrote necessary unit tests
• I updated Storybook stories and documentation to reflect the latest changes
• I included visual regression tests for new UI design
• I tested my implementation with different browsers
• I checked accessibility according to Web Content Accessibility Guidelines 2.1
• Together with the reviewer I can confirm that the implementation supports the following screenreader and browser combinations (NVDA + Firefox, VoiceOver + Chrome)

[github-actions]

Lines	Statements	Branches	Functions
	94.82% (13696/14444)	89.28% (1425/1596)	91.08% (531/583)

Coverage Report • (94%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	94.82	89.28	91.08	94.82

report-only-changed-files is enabled. No files were changed in this commit :)

[RiinaKuu]

We usually want to keep our package.json and lock-file versions in sync, just for consistency/readability. But since we don't need to force the use of 3.8.3, we can let it be as is.

[RiinaKuu]

I noticed there was dependabot pull (with green pipeline) with the same update, so I decided to merge that, since the current developer is absent. Will close this PR.