rpc: Make sure we internally use uint32 for latestledger in getEvents #3341

Job	Run time
Integration tests (ubuntu-20.04, 1.21, .CLI.)	15m 55s
Unit tests (ubuntu-20.04, 1.21)	6m 15s
Integration tests (ubuntu-20.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	13m 12s
Unit tests (ubuntu-22.04, 1.21)	6m 38s
Integration tests (ubuntu-22.04, 1.21, .CLI.)	15m 47s
Integration tests (ubuntu-22.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	13m 4s
Build (ubuntu-latest, x86_64-unknown-linux-gnu, amd64)	2m 27s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, arm64)	2m 51s
Build (macos-latest, x86_64-apple-darwin, amd64)	6m 28s
Build (macos-latest, aarch64-apple-darwin, arm64)	6m 25s
Build (windows-latest, x86_64-pc-windows-gnu, amd64)	9m 22s
	1h 38m 24s

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