Hotfix adjust sed expression for flake update hs backend #6374

Job	Run time
Pyk: Code Quality & Unit Tests (3.10)	1m 25s
Java: Linting	1m 16s
Pyk: Code Quality & Unit Tests (3.11)	1m 12s
Pyk: Code Quality & Unit Tests (3.12)	1m 24s
Code Quality Checks	1s
K: Source Build & Test	2m 20s
K: Ubuntu Jammy Frontend Package	2m 19s
Pyk: Nix Build (ubuntu-latest)	52s
K: Ubuntu Jammy Package	2m 19s
Pyk: Nix Build (macos-14)	1m 36s
K: Nix Build & Test (self-hosted, linux, normal)	2m 20s
K: Nix Build & Test (MacM1, self-macos-12)	11s
Pyk: Integration Tests	1s
Pyk: Documentation	1s
Pyk: Profiling	1s
Pyk: Regression Tests	1s
	17m 19s

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