Updates CRS dependency

[M4tteoP]

Updates coraza-coreruleset dependency. It notably includes rule 920620 meant to address CVE-2023-38199 – Multiple Content-Type Headers.

The PR also:

• Updates go CI to 1.20
• Updates Caddy to 2.7.3
• Updates Coraza to 3.0.3
• Removes content-length header when a response body rule is triggered
• Relies on the new e2e utility provided by Coraza: https://github.com/corazawaf/coraza#e2e-testing

[sonarcloud[bot]]

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