fix: address serialization in PayForBlobs event #2430

Job	Run time
branch_name	1s
goreleaser-check	7s
lint / golangci-lint	2m 41s
lint / yamllint	7s
markdown-linter / markdown-link-check	1m 55s
markdown-linter / markdown-lint	9s
test / test	17m 38s
test / test-coverage	5m 50s
test / test-short	2m 43s
test / test-race	10m 14s
lint / hadolint / hadolint	11s
version_bump	6s
goreleaser	0s
	41m 42s

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