fix(deps): update module golang.org/x/vuln/cmd/govulncheck to v1.8.0

[guided-traffic-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
golang.org/x/vuln/cmd/govulncheck	v1.7.0 → v1.8.0

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[github-actions]

📊 Combined Test Coverage Report

Current Coverage: 85.2%
Main Branch Coverage: 85.2%
Difference: ➡️ 0.0%

📁 Coverage by package

Package	Coverage	Statements
github.com/guided-traffic/mosquitto-operator/api/v1	90.0%	72/80
github.com/guided-traffic/mosquitto-operator/cmd	36.8%	25/68
github.com/guided-traffic/mosquitto-operator/internal/builder	99.0%	97/98
github.com/guided-traffic/mosquitto-operator/internal/common	100.0%	35/35
github.com/guided-traffic/mosquitto-operator/internal/controller	92.6%	126/136
github.com/guided-traffic/mosquitto-operator/test/testimages	100.0%	3/3

Unit and integration tests combined. The full per-function report is in this
job's summary and in the coverage-combined artifact — it is deliberately not
inlined here, because a with: input travels to the action as one environment
variable and Linux caps that at 131072 bytes.