perf: remove unnecessary heap allocation (#7731) #8075

Job	Run time
test (x86_64-pc-windows-msvc, windows-latest, 1.65.0, false, test, --no-default-features, no-defa...	15m 55s
test (x86_64-pc-windows-msvc, windows-latest, 1.65.0, false, test, --features compression, all)	11m 29s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.65.0, false, test, --no-default-features, no-def...	10m 47s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.65.0, false, test, --features compression, all)	9m 16s
test (x86_64-apple-darwin, macos-latest, 1.65.0, false, test, --no-default-features, no-default)	4m 52s
test (x86_64-apple-darwin, macos-latest, 1.65.0, false, test, --features compression, all)	8m 32s
test (aarch64-apple-ios, macos-latest, 1.65.0, false, build, --no-default-features, no-default)	6m 30s
test (aarch64-apple-ios, macos-latest, 1.65.0, false, build, --features compression, all)	7m 33s
test (aarch64-linux-android, ubuntu-latest, 1.65.0, true, build, --no-default-features, no-default)	7m 50s
test (aarch64-linux-android, ubuntu-latest, 1.65.0, true, build, --features compression, all)	8m 36s
	1h 31m 20s

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