Add bison and flex to required packages

[StrangeRanger]

This pull request updates the Nginx WAF installation script to fix a missing dependency issue and introduces several TODOs for future improvements. The main change ensures that all required packages are installed for building ModSecurity from source.

Dependency Fix:

• Added bison and flex to the list of required packages in C_REQUIRED_PKGS to resolve build issues with ModSecurity. [1] [2]

Documentation Updates:

• Bumped the script version to v1.0.1 and updated the changelog to reflect the dependency fix. [1] [2]

Future Improvements (TODOs):

• Added a TODO to check and offer to update ModSecurity instead of always fetching the latest version.
• Added TODOs to prevent overwriting existing modsecurity.conf and crs-setup.conf files if they have been modified. [1] [2]

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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[Copilot]

Copilot review overview

🟢 Approval recommended

The dependencies use the existing installation flow, and no blocking issues were identified.

Review effort: Balanced
Findings: None

What changed in this PR

Fixes missing build dependencies in the Nginx WAF installer.

Changes:

• Adds bison and flex for building ModSecurity.
• Bumps the script version to v1.0.1 and records the fix.
• Adds TODO comments for update prompts and configuration preservation; behavior remains unchanged.

File	Description
hardening/​Nginx WAF/​nginx-waf.bash	Adds dependencies, updates the version, and documents future improvements.
hardening/​Nginx WAF/​CHANGELOG.md	Records the dependency fix for v1.0.1.

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