fix(deps): update module github.com/cenkalti/backoff/v4 to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/cenkalti/backoff/v4	v4.3.0 → v5.0.3

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Release Notes

cenkalti/backoff (github.com/cenkalti/backoff/v4)

v5.0.3

Compare Source

v5.0.2

Compare Source

v5.0.1

Compare Source

v5.0.0

Compare Source

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Configuration

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[codecov-commenter]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
5493	2	5491	557

View the top 2 failed test(s) by shortest run time

github.com/steveyegge/beads/cmd/bd::TestIsOrchestratorRoot_FalseWhenMarkersMissing

Stack Traces | 0s run time

=== RUN   TestIsOrchestratorRoot_FalseWhenMarkersMissing
--- FAIL: TestIsOrchestratorRoot_FalseWhenMarkersMissing (0.00s)

github.com/steveyegge/beads/cmd/bd::TestIsOrchestratorRoot_FalseWhenMarkersMissing/missing_town

Stack Traces | 0s run time

=== RUN   TestIsOrchestratorRoot_FalseWhenMarkersMissing/missing_town
    doctor_gastown_guard_test.go:65: expected .../tmp/TestIsOrchestratorRoot_FalseWhenMarkersMissingmissing_town541347720/001 to NOT be detected as orchestrator root
--- FAIL: TestIsOrchestratorRoot_FalseWhenMarkersMissing/missing_town (0.00s)

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