libkml: use version range for expat, limit cpp standard to c++14

[mayeut]

Specify library name and version: libkml/all

expat<2.6.2 has known security issues. We can now use version range: c.f. #23277

fix validation when using cpp standard > 14

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• I've read the contributing guidelines.
• I've used a recent Conan client version close to the currently deployed.
• I've tried at least one configuration locally with the conan-center hook activated.

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 2 (02e89e8841b5b5e9c13e9b97c9a356fbf7603522):

• libkml/1.3.0:
  All packages built successfully! (All logs)

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Conan v2 pipeline ✔️

Note: Conan v2 builds are now mandatory. Please read our discussion about it.

All green in build 2 (02e89e8841b5b5e9c13e9b97c9a356fbf7603522):

• libkml/1.3.0:
  All packages built successfully! (All logs)

[valgur]

Created a PR for the C++17 compatibility issue: #23678

[ghost]

I detected other pull requests that are modifying libkml/all recipe:

• libkml: fall back to C++14 #23755
• libkml: add a patch for C++17 compatibility #23678

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[AbrilRBS]

Let's wait for @valgur's PR to get merged for your changes :)

[jcar87]

Superseded by #23665