Bump edition to 2021

[wcampbell0x2a]

Closes #356

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Benchmark for 10c2454

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| Test | Base | PR | % | |------|--------------|------------------|---| | deku_read_bits | 1231.8±13.88ns | 1235.3±36.89ns | +0.28% | | deku_read_byte | 20.8±0.32ns | 21.1±0.43ns | +1.44% | | deku_read_enum | 9.4±0.14ns | 9.5±0.31ns | +1.06% | | deku_read_vec | 58.1±3.73ns | 58.3±1.00ns | +0.34% | | deku_write_bits | **126.1±4.47ns** | 141.9±6.22ns | **+12.53%** | | deku_write_byte | 132.1±5.10ns | **127.9±2.94ns** | **-3.18%** | | deku_write_enum | 93.2±5.35ns | 94.3±2.91ns | +1.18% | | deku_write_vec | 3.1±0.03µs | 3.1±0.04µs | 0.00% |

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Benchmark for 1680e06

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| Test | Base | PR | % | |------|--------------|------------------|---| | deku_read_bits | 1212.8±34.73ns | **1182.3±16.62ns** | **-2.51%** | | deku_read_byte | **20.8±0.17ns** | 21.1±0.39ns | **+1.44%** | | deku_read_enum | 9.4±0.12ns | 9.4±0.15ns | 0.00% | | deku_read_vec | 57.9±0.71ns | 58.5±1.38ns | +1.04% | | deku_write_bits | **126.0±5.47ns** | 138.6±10.76ns | **+10.00%** | | deku_write_byte | 138.3±7.83ns | **130.6±4.81ns** | **-5.57%** | | deku_write_enum | 91.6±4.69ns | 95.5±6.77ns | +4.26% | | deku_write_vec | 3.1±0.05µs | 3.1±0.05µs | 0.00% |

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Benchmark for 5f413ba

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| Test | Base | PR | % | |------|--------------|------------------|---| | deku_read_bits | 1227.5±12.15ns | **1196.4±10.02ns** | **-2.53%** | | deku_read_byte | 20.8±0.21ns | 20.9±0.44ns | +0.48% | | deku_read_enum | 9.6±0.15ns | **9.4±0.16ns** | **-2.08%** | | deku_read_vec | **57.3±0.62ns** | 59.0±0.72ns | **+2.97%** | | deku_write_bits | **125.5±5.21ns** | 132.4±2.35ns | **+5.50%** | | deku_write_byte | 129.5±5.77ns | 133.6±5.93ns | +3.17% | | deku_write_enum | 93.8±3.81ns | 93.6±4.76ns | -0.21% | | deku_write_vec | 3.1±0.08µs | 3.1±0.06µs | 0.00% |