Changed the type of Tx size to Word32 #19631

Job	Run time
fourmolu	28s
Check branch history	11s
gen-hie	26s
shellcheck	5s
cabal-format	5s
Check if formal-ledger-specifications SRP is valid	24s
build (9.6.7, ubuntu-latest)	27s
build (9.8.4, ubuntu-latest)	26s
build (9.10.2, ubuntu-latest)	25s
Check that there are no additions of `undefined`s in the PR diff	11s
build (9.12.2, ubuntu-latest)	27s
codegen	1s
Tests completed	3s
${{ matrix.package }}-${{ matrix.ghc }}-${{ matrix.os }}	1s
Send a slack notification on \#ledger-internal if the nightly build failed	1s
	3m 41s

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