chore: update API to 0.21.0

[dyladan]

No description provided.

[codecov]

Codecov Report

Merging #2255 (369c4e0) into main (4a07850) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2255   +/-   ##
=======================================
  Coverage   92.79%   92.79%           
=======================================
  Files         144      144           
  Lines        5178     5178           
  Branches     1062     1060    -2     
=======================================
  Hits         4805     4805           
  Misses        373      373           

Impacted Files	Coverage Δ
...sync-hooks/src/AbstractAsyncHooksContextManager.ts	97.01% <100.00%> (ø)
...ry-context-zone-peer-dep/src/ZoneContextManager.ts	85.18% <100.00%> (ø)
...ry-instrumentation-grpc/src/grpc-js/clientUtils.ts	92.59% <100.00%> (ø)
...ry-instrumentation-grpc/src/grpc-js/serverUtils.ts	91.66% <100.00%> (ø)
...metry-instrumentation-grpc/src/grpc/clientUtils.ts	88.40% <100.00%> (ø)
...metry-instrumentation-grpc/src/grpc/serverUtils.ts	100.00% <100.00%> (ø)
...ges/opentelemetry-instrumentation-http/src/http.ts	95.68% <100.00%> (ø)
...kages/opentelemetry-web/src/StackContextManager.ts	97.05% <100.00%> (ø)

[MSNev]

Approved -- with suggestions