Pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
gulp (source)	devDependencies	pin	^4.0.2 -> 4.0.2
gulp-postcss	devDependencies	pin	^8.0.0 -> 8.0.0
tap-spec	devDependencies	pin	^5.0.0 -> 5.0.0
tape	devDependencies	pin	^5.0.1 -> 5.0.1

📌 Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges your config if you instead don't wish to pin dependencies.

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