ci: e2e and gomod2nix fail with a missing go.sum entry for gomega

[UnstoppableMango]

e2e fails on main and gomod2nix fails on every PR:

# github.com/unmango/devctl/pkg/agents
agents_suite_test.go:7:2: missing go.sum entry for module providing package github.com/onsi/gomega (imported by github.com/unmango/devctl/pkg/agents)

main has been failing since #86 (Update module github.com/onsi/gomega to v1.41.0), which changed go.mod without tidying go.sum.
Fix: run go mod tidy and regenerate gomod2nix.toml (nix run .#tidy).

Root cause tracked in UnstoppableMango/renovate-config#41.

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