Pin dependency wpackagist-plugin/multisite-custom-css to 1.0

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-plugin/multisite-custom-css (source)	require	pin	^1.0 -> 1.0

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

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