block-padding: add `'static` bound to `Padding` (#1248) #1935

Job	Run time
test (stable)	12s
test (1.85.0)	14s
build (1.85.0, wasm32-unknown-unknown)	14s
build (stable, thumbv7em-none-eabi)	30s
build (1.85.0, thumbv7em-none-eabi)	13s
build (stable, wasm32-unknown-unknown)	22s
minimal-versions / minimal-versions	28s
	2m 13s

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