Set CXX standard based on PQXX version

[bradfordboyle]

Summary by CodeRabbit

• Chores
  • Updated build system to support modern C++ language standards based on library version detection, enabling improved compiler compatibility and support for newer features across different environments.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 201bffb4-bd69-4441-8a90-937ed4369b3f

📥 Commits

Reviewing files that changed from the base of the PR and between ecfcb16 and 7622f12.

📒 Files selected for processing (1)

• CMakeLists.txt

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Walkthrough

The build configuration now selects the C++ language standard dynamically based on the detected libpqxx version. For libpqxx 8.0.0 and later, the project uses C++20; for 7.0.0 and later, C++17; and for older versions, C++14 with a backward-compatibility macro defined.

Changes

Build Configuration Update

Layer / File(s)	Summary
C++20 support for libpqxx 8.0.0+ CMakeLists.txt	CMake build configuration adds explicit version check for PQXX_VERSION >= 8.0.0 to select C++20 standard, maintaining existing C++17 (for 7.0.0+) and C++14 (fallback) conditionals.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A rabbit hops through build-time code,
C++ standards on the road,
Twenty when libpqxx is eight,
Seventeen for those past seven's gate,
Backward compat, old and new—
Build scripts hopping straight through! 🐰

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: setting the C++ standard selection based on detected PQXX version across different version branches.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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