ci: Update toolchain before running #118

Job	Run time
Rustfmt	11s
Examples Bench (ubuntu-latest)	2m 57s
Clippy (ubuntu-latest)	28s
Examples Test (ubuntu-latest, stable)	1m 13s
Clippy (macos-latest)	58s
Internals Bench (ubuntu-latest)	24s
Examples Bench (macos-latest)	5m 44s
Examples Test (ubuntu-latest, nightly)	1m 8s
Examples Bench (windows-latest)	4m 51s
Clippy (windows-latest)	1m 48s
Internals Bench (macos-latest)	1m 13s
Examples Test (macos-latest, stable)	1m 35s
Internals Bench (windows-latest)	1m 1s
Examples Test (macos-latest, nightly)	2m 1s
Rustdoc	19s
Examples Test (windows-latest, stable)	2m 9s
Unit Test (ubuntu-latest, stable)	40s
Unit Test (Miri)	1m 7s
Examples Test (windows-latest, nightly)	1m 59s
Unit Test (ubuntu-latest, nightly)	36s
Unit Test (macos-latest, stable)	1m 43s
Unit Test (macos-latest, nightly)	1m 31s
Unit Test (windows-latest, stable)	1m 22s
Unit Test (windows-latest, nightly)	1m 7s
	38m 5s

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