fix(deps): bump OTel SDK with knative.dev/pkg semconv alignment

[infernus01]

Changes

Bumps knative.dev/pkg to v0.0.0-20260918182429-5dc1978f0042to address a startup panic caused by conflicting OpenTelemetry schema URLs.

The dependabot next dependency combination uses OTel components with different schema versions: https://opentelemetry.io/schemas/1.43.0 and https://opentelemetry.io/schemas/1.41.0. At startup, knative.dev/pkg/observability/resource.Default() calls resource.Merge(), which detects the conflicting schema URLs and panics (exit code 2, CrashLoopBackOff).

panic: conflicting Schema URL: https://opentelemetry.io/schemas/1.43.0 and https://opentelemetry.io/schemas/1.41.0

goroutine 1 [running]:
knative.dev/pkg/observability/resource.Default({0x1fe01d1, 0x18})
        knative.dev/pkg@v0.0.0-20260622140654-39ebae2ee2dc/observability/resource/default.go:66 +0x3fc
knative.dev/pkg/injection/sharedmain.SetupObservabilityOrDie({0x2129160, 0xc3b6bf9c810}, {0x1fe01d1, 0x18}, 0xc3b6bba00f0, 0xc3b6bdcc180)
        knative.dev/pkg@v0.0.0-20260622140654-39ebae2ee2dc/injection/sharedmain/main.go:400 +0xc0
knative.dev/pkg/injection/sharedmain.MainWithConfig({0x2129160, 0xc3b6be7f200}, {0x1fe01d1, 0x18}, 0xc3b6be79688, {0xc3b6be13ef8, 0x4, 0x4})
        knative.dev/pkg@v0.0.0-20260622140654-39ebae2ee2dc/injection/sharedmain/main.go:286 +0x5a4
main.main()
        github.com/tektoncd/pruner/cmd/controller/main.go:60 +0x2d4

Fix: Align the knative.dev/pkg dependency with the OTel SDK version used by the application so that observability resources use a consistent schema URL and the controller can start successfully.

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Release Notes

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[infernus01]

/kind misc

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.40%. Comparing base (546f026) to head (38710c2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #441   +/-   ##
=======================================
  Coverage   50.40%   50.40%           
=======================================
  Files          19       19           
  Lines        2113     2113           
=======================================
  Hits         1065     1065           
  Misses        916      916           
  Partials      132      132           

Flag	Coverage Δ
unit-tests	50.40% <ø> (ø)

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