fix: use %d format verb for ShellCompDirective in test error message

[amitmishra11]

Summary

Go 1.26 tightened go vet to flag %q used with non-string/rune arguments as an error. ShellCompDirective is defined as type ShellCompDirective int, so the format call on line 3730 of completions_test.go now fails the vet check and prevents the test suite from compiling on Go 1.26.

./completions_test.go:3730:37: (*testing.common).Errorf format %q has arg directive of wrong type github.com/spf13/cobra.ShellCompDirective

Changes

• completions_test.go line 3730: replace %q with %d in the t.Errorf call that formats a ShellCompDirective value

Testing

$ go test ./...
ok  github.com/spf13/cobra      9.4s
ok  github.com/spf13/cobra/doc  0.4s

Fixes #2422

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[ccoVeille]

Duplicates of

• test: fix completions test failure on Go 1.26 #2423