Upgrade semconv generator to v0.14.0 (#2725)

This unblocks #2702 by making the changes introduced in open-telemetry/build-tools#114 available for use.

It also allows for more semantic conventions for scope attributes to be defined in the future (#2682).

See https://github.com/open-telemetry/build-tools/releases/tag/v0.14.0.

semantic_conventions/README.md

@@ -17,12 +17,12 @@ i.e.:
 Semantic conventions for the spec MUST adhere to the
 [attribute naming](../specification/common/attribute-naming.md) and [requirement level](../specification/common/attribute-requirement-level.md) conventions.
 
-Refer to the [syntax](https://github.com/open-telemetry/build-tools/tree/v0.12.1/semantic-conventions/syntax.md)
+Refer to the [syntax](https://github.com/open-telemetry/build-tools/tree/v0.14.0/semantic-conventions/syntax.md)
 for how to write the YAML files for semantic conventions and what the YAML properties mean.
 
 A schema file for VS code is configured in the `/.vscode/settings.json` of this
 repository, enabling auto-completion and additional checks. Refer to
-[the generator README](https://github.com/open-telemetry/build-tools/tree/v0.12.1/semantic-conventions/README.md) for what extension you need.
+[the generator README](https://github.com/open-telemetry/build-tools/tree/v0.14.0/semantic-conventions/README.md) for what extension you need.
 
 ## Generating markdown
 
@@ -33,7 +33,7 @@ formatted Markdown tables for all semantic conventions in the specification. Run
 make table-generation
 ```
 
-For more information, see the [semantic convention generator](https://github.com/open-telemetry/build-tools/tree/v0.12.1/semantic-conventions)
+For more information, see the [semantic convention generator](https://github.com/open-telemetry/build-tools/tree/v0.14.0/semantic-conventions)
 in the OpenTelemetry build tools repository.
 Using this build tool, it is also possible to generate code for use in OpenTelemetry
 language projects.