jinja2cpp: update dependencies

[toge]

Specify library name and version: jinja2cpp/*

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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 3 (809c60bdfea60adfb056288cdada5354dbe87da0):

• jinja2cpp/1.2.1:
  All packages built successfully! (All logs)

• jinja2cpp/1.1.0:
  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 3 (809c60bdfea60adfb056288cdada5354dbe87da0):

• jinja2cpp/1.2.1:
  All packages built successfully! (All logs)

• jinja2cpp/1.1.0:
  All packages built successfully! (All logs)