Bump opentelemetry-instrumentation-active_model_serializers from 0.21.0 to 0.21.1 #4220

Job	Run time
test-ruby-matrix (4, 0)	4m 4s
test-ruby-matrix (4, 1)	3m 29s
test-ruby-matrix (4, 2)	2m 56s
test-ruby-matrix (4, 3)	2m 6s
Lint Ruby / Run RuboCop	22s
Dependency Review scan / dependency-review-pr	7s
CodeQL SAST scan / Analyze	1m 26s
Dependency Review scan / dependency-review-push	0s
Lint JavaScript / Run Standardx	10s
Lint SCSS / Run Stylelint	12s
Test JavaScript / Run Jasmine	34s
Security Analysis / Run Brakeman	37s
Test Ruby	1s
	16m 4s

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