add types for gatsby-image/withIEPolyfill to fix #14592

[janKir]

Description

add types for gatsby-image/withIEPolyfill

Related Issues

fixes #14592

[resir014]

Thanks @janKir! Just one more thing:

[gatsbot]

Holy buckets, @janKir — we just merged your PR to Gatsby! 💪💜

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Thanks again!

[freiksenet]

Thank you!