dtl: support gcc 14

[toge]

Summary

Changes to recipe: **dtl/***

Motivation

To support gcc 14, make enableTrivial mutable. https://github.com/cubicdaiya/dtl/pull/18

Details

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• [x] Read the contributing guidelines
• [x] Checked that this PR is not a duplicate: list of PRs by recipe
• [x] Tested locally with at least one configuration using a recent version of Conan

[conan-center-bot]

Conan v1 pipeline :x:

Sorry, the system is under maintenance and it doesn't accept builds right now.

Motivation: Scheduled maintenance

Please, check https://status.conan.io to obtain more information. Thanks for your understanding and help with the Conan Center Index!

[conan-center-bot]

Conan v1 pipeline :heavy_check_mark:

All green in build 2 (eee94c8e1d7044b5167c2c18ac1b2359862f3ba0):

• dtl/1.20: All packages built successfully! (All logs)

• dtl/1.19: All packages built successfully! (All logs)

• dtl/cci.20210404: All packages built successfully! (All logs)

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Conan v2 pipeline :heavy_check_mark:

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

All green in build 2 (eee94c8e1d7044b5167c2c18ac1b2359862f3ba0):

• dtl/cci.20210404: All packages built successfully! (All logs)

• dtl/1.19: All packages built successfully! (All logs)

• dtl/1.20: All packages built successfully! (All logs)