Fix number conversion for Go 1.26 #6540

Job	Run time
build	3m 12s
format	3m 25s
lint (ubuntu-latest)	4m 46s
lint (noembed)	4m 49s
lint (windows-latest)	9m 52s
extension	1m 1s
test (windows-latest)	18m 33s
test (ubuntu-latest)	9m 55s
test (noembed)	8m 32s
test (no submodules)	7m 5s
test (macos-latest)	9m 16s
test (concurrent test programs)	10m 32s
generate	4m 41s
test (race mode)	14m 0s
baselines	7m 49s
tidy	1m 3s
smoke	5m 29s
misc	55s
required	4s
	2h 4m 59s

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