Configure automatic Dependabot updates #1089

Job	Run time
Build benchmarks	36s
Compute binary sizes	41s
Build documentation	9s
Fuzz test (fill_first_fit)	2m 59s
Minimum supported Rust version (no default features)	13s
Ubuntu (stable, no default features)	15s
Build Wasm demo	32s
Fuzz test (fill_optimal_fit)	2m 59s
Minimum supported Rust version (all features)	24s
Ubuntu (stable, all features)	15s
Fuzz test (fill_fast_path)	3m 1s
Minimum supported Rust version (default features)	18s
Ubuntu (stable, default features)	12s
Fuzz test (wrap_first_fit)	2m 58s
Windows (stable, default features)	1m 2s
Ubuntu (nightly, no default features)	14s
Fuzz test (wrap_optimal_fit)	3m 5s
Ubuntu (nightly, all features)	29s
Fuzz test (wrap_optimal_fit_usize)	3m 10s
Ubuntu (nightly, default features)	19s
Fuzz test (wrap_fast_path)	3m 0s
Fuzz test (unfill)	3m 0s
Fuzz test (refill)	3m 1s
Deploy Wasm demo	0s
	32m 52s

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