fix: add missing dev dependencies

[dyladan]

Which problem is this PR solving?

• @opentelemetry/core and @opentelemetry/plugin-grpc are missing the @types/semver dev dependency, which causes build failures. The issue was not caught because @types/semver is in the root package.json and only manifests if yarn install has not been run in the root of the project.

Short description of the changes

• Add missing dependencies

[codecov-io]

Codecov Report

Merging #516 into master will increase coverage by 1.98%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #516      +/-   ##
==========================================
+ Coverage   90.24%   92.22%   +1.98%     
==========================================
  Files         141      140       -1     
  Lines        7019     6613     -406     
  Branches      619      589      -30     
==========================================
- Hits         6334     6099     -235     
+ Misses        685      514     -171

Impacted Files	Coverage Δ
...ges/opentelemetry-tracing/src/NoopSpanProcessor.ts	66.66% <0%> (-8.34%)	⬇️
packages/opentelemetry-tracing/src/config.ts	100% <0%> (ø)	⬆️
packages/opentelemetry-tracing/src/utility.ts	100% <0%> (ø)	⬆️
...ges/opentelemetry-exporter-zipkin/src/transform.ts	100% <0%> (ø)	⬆️
...core/src/context/propagation/NoopHttpTextFormat.ts	100% <0%> (ø)	⬆️
.../opentelemetry-exporter-zipkin/test/zipkin.test.ts	100% <0%> (ø)	⬆️
.../opentelemetry-plugin-dns/test/utils/assertSpan.ts	100% <0%> (ø)	⬆️
...ry-tracing/test/export/SimpleSpanProcessor.test.ts	100% <0%> (ø)	⬆️
.../opentelemetry-core/src/trace/spancontext-utils.ts	100% <0%> (ø)	⬆️
...try-node/test/instrumentation/PluginLoader.test.ts	100% <0%> (ø)	⬆️
... and 36 more