[#4832] Fix json schema matcher in Objects API #14875

Job	Run time
Set up docker build 'dynamic' env variables	1s
Build and check documentation	4m 0s
End-to-end tests, chromium	13m 34s
Run the Django test suite	8m 31s
Run the Django test suite in reverse	5m 49s
End-to-end tests, firefox	16m 24s
End-to-end tests, webkit	12m 19s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 46s
docker_build (production) / Build image	2m 42s
Simulate upgrading instances (2.7.4)	1m 20s
Simulate upgrading instances (2.7.8)	1m 26s
Scan docker image	2m 6s
Check for unexepected OAS changes	31s
Generate SDKs from OAS	33s
Generate Postman collection from OAS	13s
Validate OAS	16s
Push Docker image	0s
update-docker-readme	0s
	1h 12m 31s

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