fix: enable std with jwt #4788

Job	Run time
doctest	3m 26s
test ubuntu-latest stable --no-default-features	2m 46s
test ubuntu-latest stable	2m 36s
check no_std	1m 16s
test ubuntu-latest stable --all-features	3m 10s
test ubuntu-latest nightly --no-default-features	2m 39s
clippy	1m 40s
test ubuntu-latest nightly	2m 30s
test ubuntu-latest nightly --all-features	3m 5s
test ubuntu-latest 1.79 --no-default-features	1m 43s
docs	1m 59s
test ubuntu-latest 1.79	1m 47s
feature-checks	8m 50s
test windows-latest stable --no-default-features	6m 29s
wasm-unknown	2m 47s
test windows-latest stable	7m 4s
wasm-wasi	3m 42s
test windows-latest stable --all-features	6m 17s
test windows-latest nightly --no-default-features	6m 25s
test windows-latest nightly	5m 36s
cfg-check	1m 14s
test windows-latest nightly --all-features	6m 4s
test windows-latest 1.79 --no-default-features	3m 51s
fmt	15s
test windows-latest 1.79	3m 56s
	1h 31m 7s

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