Update average requirement from 0.14 to 0.15 #174

Job	Run time
Test mips-unknown-linux-gnu	2m 22s
docs	22s
Test aarch64-unknown-linux-gnu	1m 41s
Bench ubuntu-latest	6m 54s
Test armv5te-unknown-linux-gnueabi	1m 47s
Bench windows-latest	8m 49s
feature-check	1m 23s
Test arm-unknown-linux-gnueabi	1m 31s
Test mipsel-unknown-linux-gnu	2m 26s
Bench macOS-latest	7m 13s
Test armv7-unknown-linux-gnueabihf	1m 41s
fmt	14s
Test 1.60.0/ubuntu-20.04	28s
Test 1.60.0/ubuntu-22.04	28s
Test 1.60.0/macOS-11	1m 11s
Test 1.60.0/macOS-12	59s
Test 1.60.0/windows-2019	1m 36s
Test 1.60.0/windows-2022	1m 35s
Test stable/ubuntu-20.04	29s
Test stable/ubuntu-22.04	29s
Test stable/macOS-11	1m 11s
Test stable/macOS-12	55s
Test stable/windows-2019	1m 18s
Test stable/windows-2022	1m 31s
Test nightly/ubuntu-20.04	44s
Test nightly/ubuntu-22.04	42s
Test nightly/macOS-11	1m 7s
Test nightly/macOS-12	1m 1s
Test nightly/windows-2019	1m 39s
Test nightly/windows-2022	1m 22s
	55m 8s

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