LIVE-2648: Caption style fix

[faresite]

Why are you doing this?

@JamieB-gu made this PR implementing the caption design fixes guardian/image-rendering#287

This PR simply tests the fix by bumping image-rendering to that PR's commit version.

Screenshots

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[JamieB-gu]

@faresite release here.

[faresite]

@JamieB-gu I bumped it to v7.0.0 but I can't get it to build, I'm getting some dependency resolve errors, they're a bit odd as it mentions guardian/image-rendering@6.0.0 but there's no reference to 6.0.0 the package lock . I'm trying to find it manually in the dependency tree but haven't found it yet. The full error is:

npm ERR! npm ERR! While resolving: @guardian/image-rendering@6.0.0
npm ERR! npm ERR! Found: typescript@4.3.4
npm ERR! npm ERR! node_modules/typescript
npm ERR! npm ERR!   typescript@"^4.3.4" from the root project
npm ERR! npm ERR!
npm ERR! npm ERR! Could not resolve dependency:
npm ERR! npm ERR! peer typescript@"^3.8.0" from @guardian/types@4.0.0
npm ERR! npm ERR! node_modules/@guardian/types
npm ERR! npm ERR!   @guardian/types@"github:guardian/types#semver:^4.0.0" from the root project

[faresite]

There's a concern that the captions are smaller than the templates, and this PR would be make it even smaller. Will need to clarify this with design and UX, however not a blocker at the moment as long as we don't merge the even smaller caption text. hence blocked.

@prisalcalde @benwuersching

[joecowton1]

Closing.