Pin dependencies

[dotmesh-ci-bots]

This PR contains the following updates:

Package	Type	Update	Change
browser-sync (source)	devDependencies	pin	^2.18.13 -> 2.18.13
del	devDependencies	pin	^3.0.0 -> 3.0.0
gulp (source)	devDependencies	pin	^3.9.1 -> 3.9.1
gulp-autoprefixer	devDependencies	pin	^4.0.0 -> 4.0.0
gulp-nunjucks-render	devDependencies	pin	^2.2.1 -> 2.2.1
gulp-plumber	devDependencies	pin	^1.1.0 -> 1.1.0
gulp-sass	devDependencies	pin	^3.1.0 -> 3.1.0
gulp-sass-glob	devDependencies	pin	^1.0.8 -> 1.0.8
gulp-svg-sprite	devDependencies	pin	^1.3.7 -> 1.3.7

📌 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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