chore(provider): simplify nonce filler (#976) #3002

Job	Run time
doctest	57s
cfg-check	31s
docs	56s
clippy	55s
feature-checks	2m 47s
fmt	13s
no-std	26s
test ubuntu-latest stable --no-default-features	1m 12s
wasm-unknown	44s
wasm-wasi	1m 12s
test ubuntu-latest stable	1m 14s
test ubuntu-latest nightly --no-default-features	1m 17s
test ubuntu-latest nightly	1m 13s
test ubuntu-latest 1.76 --no-default-features	36s
test ubuntu-latest 1.76	1m 12s
test windows-latest stable --no-default-features	4m 19s
test windows-latest stable	5m 28s
test windows-latest nightly --no-default-features	4m 40s
test windows-latest nightly	4m 28s
test windows-latest 1.76 --no-default-features	3m 14s
test windows-latest 1.76	3m 6s
	40m 40s

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