Remove `GUARANTEED_ALLOCATED` parameter of `BumpPool(Guard)` #114

Job	Run time
semver	15s
clippy (1.64.0, --no-default-features)	2m 33s
format	5s
clippy (stable, --no-default-features)	12s
clippy-benches	27s
clippy (nightly, --all-features, --tests)	33s
test	2m 44s
	6m 49s

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