chore(deps): upgrade `sigstore` to v4 #11970

Job	Run time
Acceptance test node versions	3s
Testing chores	2m 20s
Build artifacts	1m 30s
ubuntu-latest w/ Node.js 22.x (2/2)	5m 25s
ubuntu-latest w/ Node.js 20.x (2/2)	5m 24s
ubuntu-latest w/ Node.js 20.x (1/2)	5m 24s
windows-latest w/ Node.js 18.x (1/3)	5m 24s
macos-latest w/ Node.js 18.x (3/3)	4m 4s
ubuntu-latest w/ Node.js 18.x (1/2)	5m 29s
macos-latest w/ Node.js 18.x (2/3)	1m 50s
ubuntu-latest w/ Node.js 18.x (2/2)	5m 25s
ubuntu-latest w/ Node.js 26.x (1/2)	5m 26s
ubuntu-latest w/ Node.js 26.x (2/2)	5m 24s
macos-latest w/ Node.js 27-nightly.x (3/3)	3m 41s
windows-latest w/ Node.js 27-nightly.x (1/3)	5m 23s
ubuntu-latest w/ Node.js 24.x (1/2)	5m 30s
macos-latest w/ Node.js 27-nightly.x (1/3)	3m 39s
windows-latest w/ Node.js 18.x (2/3)	5m 23s
windows-latest w/ Node.js 27-nightly.x (2/3)	5m 23s
macos-latest w/ Node.js 18.x (1/3)	4m 14s
windows-latest w/ Node.js 27-nightly.x (3/3)	5m 18s
windows-latest w/ Node.js 18.x (3/3)	5m 23s
macos-latest w/ Node.js 27-nightly.x (2/3)	5m 8s
ubuntu-latest w/ Node.js 22.x (1/2)	5m 24s
ubuntu-latest w/ Node.js 24.x (2/2)	5m 24s
Big-endian debian w/ Node.js latest (${{ matrix.shard }})	0s
	1h 52m 58s

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