Drop `RootModel` from `JSONRPCMessage` (#1908) #203

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	32s
checks / test (3.11, lowest-direct, ubuntu-latest)	47s
checks / test (3.11, lowest-direct, windows-latest)	2m 40s
checks / test (3.10, lowest-direct, windows-latest)	2m 40s
checks / test (3.10, locked, windows-latest)	2m 19s
checks / test (3.10, lowest-direct, ubuntu-latest)	47s
checks / test (3.13, lowest-direct, ubuntu-latest)	43s
checks / test (3.10, locked, ubuntu-latest)	47s
checks / test (3.13, locked, ubuntu-latest)	41s
checks / test (3.12, lowest-direct, windows-latest)	3m 25s
checks / test (3.11, locked, windows-latest)	2m 33s
checks / test (3.12, locked, windows-latest)	3m 41s
checks / test (3.13, locked, windows-latest)	2m 23s
checks / test (3.14, locked, windows-latest)	3m 59s
checks / test (3.12, locked, ubuntu-latest)	50s
checks / test (3.11, locked, ubuntu-latest)	41s
checks / test (3.14, lowest-direct, windows-latest)	2m 24s
checks / test (3.13, lowest-direct, windows-latest)	2m 27s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.14, locked, ubuntu-latest)	2m 12s
all-green	4s
	38m 44s

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