Specify bumpalo 3.14 for now to unblock PRs #287

Job	Run time
Check+Test default features (stable)	1m 15s
Check and test WebAssembly with SIMD (stable)	1m 5s
Check+Test no features (stable)	34s
Check+Test default features (beta)	1m 21s
Check and test Linux arm 64bit with neon (stable)	1m 47s
Check and test WebAssembly with SIMD (beta)	1m 3s
Check+Test no features (beta)	39s
Check+Test default features (nightly)	1m 24s
Check and test Linux arm 64bit with neon (beta)	1m 51s
Check and test WebAssembly with SIMD (nightly)	1m 6s
Check+Test no features (nightly)	38s
Check+Test default features (1.61)	4m 51s
Check and test Linux arm 64bit with neon (nightly)	1m 56s
Check and test WebAssembly with SIMD (1.61)	4m 10s
Check+Test no features (1.61)	3m 56s
Check and test Linux arm 64bit with neon (1.61)	5m 21s
Check and test Linux x86 32bit	1m 30s
Rustfmt	13s
	34m 40s

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