[scippp] add version 1.2.0

[hedtke]

Specify library name and version: scippp/1.2.0

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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.

[hedtke]

@RubenRBS I'd like to ping here :-)

[AbrilRBS]

Thanks!

[uilianries]

LGTM

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 5 (4cc634ecddd8e133e0a7f32b1780f80fa4c6a49a):

• scippp/1.0.2:
  All packages built successfully! (All logs)

• scippp/1.2.0:
  All packages built successfully! (All logs)

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

---

Conan v2 pipeline ✔️

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

All green in build 5 (4cc634ecddd8e133e0a7f32b1780f80fa4c6a49a):

• scippp/1.0.2:
  All packages built successfully! (All logs)

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

• scippp/1.2.0:
  All packages built successfully! (All logs)