Bump subxt from 0.38.0 to 0.38.1 #1483

Job	Run time
set-image	1s
spellcheck	2m 17s
clippy-examples (STD)	12m 54s
clippy-examples (RISCV)	9m 9s
clippy	11m 21s
check (STD)	7m 40s
check (RISCV)	5m 4s
dylint	8m 33s
examples-test-mapping	11m 30s
fmt	7m 37s
build (STD)	9m 29s
test (ink)	7m 39s
build (RISCV)	5m 14s
test (linting)	7m 34s
examples-test	0s
examples-custom-test	0s
codecov	0s
docs	0s
examples-docs	9m 3s
examples-contract-build (RISCV, 1)	9m 29s
examples-contract-build (RISCV, 2)	8m 33s
examples-contract-build (RISCV, 3)	8m 42s
examples-contract-build (RISCV, 4)	8m 33s
fuzz	0s
measurements	0s
	2h 30m 22s

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