fix: mask escaped strings properly

[mwienk]

When a string in the content contains a single escaped double quote, the masking of the string fails in the CSP Nonce handler. This results in an issue with the following parts of the string, causing issues like #667

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

I updated the regex so it matches only true double quotes after the opening quotes. Escaped quotes \" are now included in the placeholder content.

Resolves #667

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes (if not applicable, please state why)

[vercel]

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