Make `sed` invocation truly portable across macOS and Linux. #3079

Job	Run time
Build binary	21s
Run tests (1.81, false)	2m 53s
Build binary (Windows)	3m 7s
Check lint and rustfmt	14s
Run tests (1.82, false)	2m 51s
Run tests (stable, false)	2m 43s
Semver: core-graphics	39s
Check if version changed	6s
Run tests (beta, false)	2m 49s
Run tests (nightly, true)	2m 45s
Caching across rustdoc versions	1m 27s
Semver: libp2p-core 0.37.0	1m 13s
Caching with feature config changed	24s
Semver: libp2p-dcutr 1.62.0 and libp2p-relay 0.14.0	1m 3s
Semver: libp2p-gossipsub ~0.44.0 + libp2p-request-response ~0.24.0	1m 10s
Semver: libp2p-uds 0.37.0	1m 39s
Semver: bevy_core v0.9.0	29s
Semver: sqllogictest v0.13.0	30s
Semver: tokio ~v1.25.0 (implicit)	4s
Semver: bevy_gltf v0.9.1	59s
Semver: clap v3.2.0	47s
Semver: dependency has warnings with "-Dwarnings" (libp2p v0.53.1)	1m 3s
Semver: ref-slice fork (git)	19s
Semver: ref-slice fork (sparse)	16s
Semver: tokio ~v1.25.0 (explicit)	5s
Check failure when installed rustc is too old	22s
Semver: perf-event-open-sys2 v5.0.0	17s
Semver: ref-slice fork (Windows) (git)	1m 24s
Semver: ref-slice fork (Windows) (sparse)	1m 17s
All CI stages	1s
Check for semver compliance	0s
Run the release workflow	0s
	33m 17s

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