rpc: Make sure we internally use uint32 for latestledger in getEvents #3282

Job	Run time
Unit tests (ubuntu-20.04, 1.21)	7m 46s
Integration tests (ubuntu-20.04, 1.21, .CLI.)	21m 55s
Integration tests (ubuntu-20.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	17m 45s
Unit tests (ubuntu-22.04, 1.21)	8m 1s
Build (ubuntu-latest, x86_64-unknown-linux-gnu, amd64)	2m 22s
Integration tests (ubuntu-22.04, 1.21, .CLI.)	20m 23s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, arm64)	2m 40s
Integration tests (ubuntu-22.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	17m 36s
Build (macos-latest, x86_64-apple-darwin, amd64)	3m 16s
Build (macos-latest, aarch64-apple-darwin, arm64)	5m 29s
Build (windows-latest, x86_64-pc-windows-gnu, amd64)	6m 49s
	1h 54m 2s

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