fix(filechecker): revert imagemin-svgo

[fiji-flo]

Summary

Update is braking the filechecker.

See: imagemin/imagemin-svgo#62

Problem

       TypeError: Expected a `string`, got `object`
           at isSvg (file:///Users/…/github/yari/node_modules/is-svg/index.js:5:9)
           at file:///Users/…/github/yari/node_modules/imagemin-svgo/index.js:11:7
           at file:///Users/…/github/yari/node_modules/p-pipe/index.js:10:25
           at handleFile (file:///Users/…/github/yari/node_modules/imagemin/index.js:17:54)
           at async file:///Users/…/github/yari/node_modules/imagemin/index.js:54:13
           at async Promise.all (index 0)
           at async checkCompression (file:///Users/…/github/yari/filecheck/checker.ts:146:23)
           at async checkFile (file:///Users/…/github/yari/filecheck/checker.ts:126:5)
           at async file:///Users/…/github/yari/filecheck/checker.ts:215:13

Solution

Downgrade and ignore in dependabot.