fix: bump maximum event stream message length to 24MB

[lauzadis]

Event streams spec was updated to say:

Additionally, services MUST validate, and clients MUST NOT validate, that:

The payload of a message may not exceed 25,165,824 bytes (24 MB).
The headers_length of a message may not exceed 131,072 bytes (128 kB). Note
that the in-memory representation of the headers, once decoded, may legally
exceed this value.

Issue #

Description of changes

Some services are returning messages >16kB, which would currently fail.

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Affected Artifacts

No artifacts changed size