Bump express from 4.19.2 to 4.21.0 in /tests/e2e/hardhat #5295

Job	Run time
Lint	5m 44s
Golang Unit Tests v1.21.7 (ubuntu-20.04)	3m 9s
e2e tests (\[APM\], ubuntu-latest)	3m 30s
Golang Unit Tests v1.21.7 (macos-13)	4m 26s
e2e tests (\[APM\], macos-13)	4m 58s
e2e tests (\[Error handling\], ubuntu-latest)	3m 34s
e2e tests (\[Error handling\], macos-13)	8m 31s
e2e tests (\[Key\], ubuntu-latest)	3m 55s
e2e tests (\[Key\], macos-13)	12m 47s
e2e tests (\[Network\], ubuntu-latest)	4m 54s
e2e tests (\[Network\], macos-13)	7m 41s
e2e tests (\[Package Management\], ubuntu-latest)	6m 14s
e2e tests (\[Package Management\], macos-13)	11m 4s
e2e tests (\[Root\], ubuntu-latest)	3m 43s
e2e tests (\[Root\], macos-13)	7m 1s
e2e tests (\[Local Subnet\], ubuntu-latest)	7m 50s
e2e tests (\[Local Subnet\], macos-13)	11m 28s
e2e tests (\[Subnet Compatibility\], ubuntu-latest)	4m 42s
e2e tests (\[Subnet Compatibility\], macos-13)	7m 23s
e2e tests (\[Public Subnet\], ubuntu-latest)	8m 6s
e2e tests (\[Subnet\], ubuntu-latest)	3m 37s
e2e tests (\[Subnet\], macos-13)	7m 23s
e2e tests (\[Upgrade expect network failure\], ubuntu-latest)	4m 6s
e2e tests (\[Upgrade expect network failure\], macos-13)	8m 16s
e2e tests (\[Upgrade public network\], ubuntu-latest)	3m 37s
e2e tests (\[Upgrade public network\], macos-13)	8m 11s
e2e tests (\[Upgrade local network\], ubuntu-latest)	9m 0s
e2e tests (\[Upgrade local network\], macos-13)	14m 45s
e2e tests (\[Node create\], ubuntu-latest)	4m 54s
e2e tests (\[Node devnet\], ubuntu-latest)	5m 33s
e2e tests (\[Docker\], ubuntu-latest)	3m 4s
	3h 23m 6s

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