opentelemetry-cpp: add version 1.8.1, update dependencies

[toge]

Specify library name and version: opentelemetry-cpp/*

• add version 1.8.1
• update dependencies (except protobuf because there is a same reason of grpc: add version 1.51.1 #14471.

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• I've read the contributing guidelines.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the conan-center hook activated.

[ghost]

I detected other pull requests that are modifying opentelemetry-cpp/all recipe:

• opentelemetry-cpp: add version 1.6.1 #13341

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

[conan-center-bot]

Conan v1 pipeline

All green in build 3 (8fd0422f39b7c7aab3af4edd2cc83feb8b6549a3):

• opentelemetry-cpp/1.6.1@:
  All packages built successfully! (All logs)

• opentelemetry-cpp/1.4.1@:
  All packages built successfully! (All logs)

• opentelemetry-cpp/1.7.0@:
  All packages built successfully! (All logs)

• opentelemetry-cpp/1.0.1@:
  All packages built successfully! (All logs)

• opentelemetry-cpp/1.4.0@:
  All packages built successfully! (All logs)

• opentelemetry-cpp/1.3.0@:
  All packages built successfully! (All logs)

• opentelemetry-cpp/1.2.0@:
  All packages built successfully! (All logs)

• opentelemetry-cpp/1.8.1@:
  All packages built successfully! (All logs)

[uilianries]

LGTM