fix(spans): adhere attribute name to otel semver

[Strazz1337]

Updates the http span attributes to match with the updated OTEL specification.

closes #344

[Strazz1337]

@microsoft-github-policy-service agree

[baywet]

Can you also add an entry to the changelog (patch, today, changed) and bump the version in the directory file please?

[baywet]

@Strazz1337 if you're comfortable in other languages and want to contribute some more, we have the same in:

• Java https://github.com/microsoft/kiota-java/issues/1540
• Python https://github.com/microsoft/kiota-http-python/issues/409
• Go https://github.com/microsoft/kiota-http-go/issues/182