Bump netlify-plugin-inline-critical-css to 1.1.1

[Tom-Bonnike]

Version 1.1.1 stops processing multiple HTML files concurrently to try and fix:

• Lingering puppeteer processes cause penthouse to timeout and build to fail Tom-Bonnike/netlify-plugin-inline-critical-css#5 (lingering puppeteer processes)
• Out-of-memory error Tom-Bonnike/netlify-plugin-inline-critical-css#3 (out of memory issues)

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• Read and followed the plugin author guidelines.
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Test plan

https://app.netlify.com/sites/tombonnike/deploys/5ed0f71664437d0007563b2e

Obviously my test project is small, but if it works on one page it will work on multiple.
Not sure about the performance impact of that change, but it’s worth trying it to see if we get less errors. :)