gnovm

fix: remove empty timestamp from the tx signature payload #5042

Job	Run time
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	23s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	27s
build (1.22.x, GOARCH=amd64 GOOS=linux, gno)	21s
test (1.21.x, _test.cmd)	1m 39s
build (1.22.x, GOARCH=wasm GOOS=js, gno)	26s
test (1.21.x, _test.pkg)	54s
test (1.21.x, _test.gnolang.native)	32s
test (1.21.x, _test.gnolang.stdlibs)	50s
test (1.21.x, _test.gnolang.realm)	32s
test (1.21.x, _test.gnolang.pkg0)	1m 49s
test (1.21.x, _test.gnolang.pkg1)	6m 31s
test (1.21.x, _test.gnolang.pkg2)	4m 4s
test (1.21.x, _test.gnolang.other)	24s
test (1.22.x, _test.cmd)	1m 24s
test (1.22.x, _test.pkg)	44s
test (1.22.x, _test.gnolang.native)	30s
test (1.22.x, _test.gnolang.stdlibs)	47s
test (1.22.x, _test.gnolang.realm)	39s
test (1.22.x, _test.gnolang.pkg0)	1m 52s
test (1.22.x, _test.gnolang.pkg1)	6m 30s
test (1.22.x, _test.gnolang.pkg2)	4m 12s
test (1.22.x, _test.gnolang.other)	22s
upload-coverage	22s
	36m 14s

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