chore(deps): pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
html-webpack-plugin	devDependencies	pin	^3.2.0 -> 3.2.0
libreoffice-convert	devDependencies	pin	^1.0.3 -> 1.0.3
npm-run-all	devDependencies	pin	^4.1.5 -> 4.1.5
text-encoding	devDependencies	pin	^0.7.0 -> 0.7.0
ts-loader	devDependencies	pin	^6.2.1 -> 6.2.1
typescript (source)	devDependencies	pin	^3.7.5 -> 3.7.5
webpack	devDependencies	pin	^4.29.4 -> 4.39.3
webpack-cli	devDependencies	pin	^3.1.1 -> 3.3.8
webpack-dev-server	devDependencies	pin	^3.1.0 -> 3.8.0

📌 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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