Update dependency @netlify/build to v26

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@netlify/build	^25.0.0 -> ^26.0.0

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Release Notes

netlify/build

### [`v26.0.0`](https://togithub.com/netlify/build/blob/HEAD/packages/build/CHANGELOG.md#​2600-httpswwwgithubcomnetlifybuildcomparebuild-v2503build-v2600-2021-12-20) [Compare Source](https://togithub.com/netlify/build/compare/2bcdf720d0f92d7d93f56143d431030ca4a1fffc...20e9e67a29bac705718f4dee554c741b56e5a652) ##### ⚠ BREAKING CHANGES - use pure ES modules with `@netlify/build` ([#​3967](https://togithub.com/netlify/build/issues/3967)) ##### Miscellaneous Chores - use pure ES modules with `@netlify/build` ([#​3967](https://www.togithub.com/netlify/build/issues/3967)) ([0fd5d1f](https://www.github.com/netlify/build/commit/0fd5d1fea070a7b1af2bbe40e11093da04b2efae)) ##### [25.0.3](https://www.github.com/netlify/build/compare/build-v25.0.2...build-v25.0.3) (2021-12-17) ##### Bug Fixes - use ESM-compatible JSON imports ([#​3964](https://www.togithub.com/netlify/build/issues/3964)) ([91b9063](https://www.github.com/netlify/build/commit/91b90632d5f32e6b3e372ac10ffbadbb0c36dc87)) ##### [25.0.2](https://www.github.com/netlify/build/compare/build-v25.0.1...build-v25.0.2) (2021-12-16) ##### Bug Fixes - **deps:** update dependency [@​netlify/zip-it-and-ship-it](https://togithub.com/netlify/zip-it-and-ship-it) to ^5.3.0 ([#​3961](https://www.togithub.com/netlify/build/issues/3961)) ([e1edaf3](https://www.github.com/netlify/build/commit/e1edaf36c325e4a0f5e3f9ef4da971544cc5e697)) ##### [25.0.1](https://www.github.com/netlify/build/compare/build-v25.0.0...build-v25.0.1) (2021-12-15) ##### Bug Fixes - upgrade `@netlify/config` ([5afa49c](https://www.github.com/netlify/build/commit/5afa49c9179bfe57678a12fc59a00e7ad583a002)) ### [`v25.0.3`](https://togithub.com/netlify/build/blob/HEAD/packages/build/CHANGELOG.md#​2503-httpswwwgithubcomnetlifybuildcomparebuild-v2502build-v2503-2021-12-17) [Compare Source](https://togithub.com/netlify/build/compare/5ecba544d00c3e3052a85ce6b796b3916501da42...2bcdf720d0f92d7d93f56143d431030ca4a1fffc) ### [`v25.0.2`](https://togithub.com/netlify/build/blob/HEAD/packages/build/CHANGELOG.md#​2502-httpswwwgithubcomnetlifybuildcomparebuild-v2501build-v2502-2021-12-16) [Compare Source](https://togithub.com/netlify/build/compare/7628fb568753f09d4b97603b75d0131ab4f6b52e...5ecba544d00c3e3052a85ce6b796b3916501da42)

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