chore: Bump golang.org/x/net to avoid CVE-2026-27136

[olivergondza]

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/kind bug
/kind cleanup
/kind failing-test
/kind enhancement
/kind documentation
/kind code-refactoring

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Which issue(s) this PR fixes:

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[olivergondza]

/retest

[olivergondza]

/retest

[olivergondza]

/retest

[openshift-ci]

@olivergondza: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/unit	84f880d	link	true	/test unit
ci/prow/v4.14-e2e	84f880d	link	true	/test v4.14-e2e
ci/prow/v4.21-e2e	84f880d	link	true	/test v4.21-e2e
ci/prow/v4.14-images	84f880d	link	true	/test v4.14-images
ci/prow/v4.21-images	84f880d	link	true	/test v4.21-images

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