[TASK] Update `flag-icons` and related build packages

This commit updates the `flag-icons` and its related build packages
`filesize` and `sharpen` to their respective latest version.

See changelog at [1].

Executed commands:

    npm install --save-dev \
        filesize@^10.1.0 \
        flag-icons@^7.1.0 \
        sharp@^0.33.1
    npm run build

[1] https://github.com/lipis/flag-icons/blob/v7.1.0/CHANGELOG.md

Resolves: #102780
Releases: main, 12.4
Change-Id: Ife74d3679d18ec374e40140183c69f912e5b1439
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82406


Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>