fix: events/codedeploy.go:16:2: SA9004 (staticcheck)

[shogo82148]

Issue #, if available:

It fixes the following staticcheck warning.

events/codedeploy.go:16:2: SA9004: only the first constant in this group has an explicit type (staticcheck)
	CodeDeployDeploymentStateFailure CodeDeployDeploymentState = "FAILURE"
	^

The warning is shown because CodeDeployDeploymentState constants have unexpected type.

package main

import (
	"fmt"

	"github.com/aws/aws-lambda-go/events"
)

func main() {
	fmt.Printf("%10[1]s: %[1]T\n", events.CodeDeployDeploymentStateFailure)
	fmt.Printf("%10[1]s: %[1]T\n", events.CodeDeployDeploymentStateReady)
	fmt.Printf("%10[1]s: %[1]T\n", events.CodeDeployDeploymentStateStart)
	fmt.Printf("%10[1]s: %[1]T\n", events.CodeDeployDeploymentStateStop)
	fmt.Printf("%10[1]s: %[1]T\n", events.CodeDeployDeploymentStateSuccess)
}

got:

   FAILURE: events.CodeDeployDeploymentState
     READY: string
     START: string
      STOP: string
   SUCCESS: string

want:

   FAILURE: events.CodeDeployDeploymentState
     READY: events.CodeDeployDeploymentState
     START: events.CodeDeployDeploymentState
      STOP: events.CodeDeployDeploymentState
   SUCCESS: events.CodeDeployDeploymentState

Description of changes:

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #322 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #322   +/-   ##
=======================================
  Coverage   72.46%   72.46%           
=======================================
  Files          18       18           
  Lines         730      730           
=======================================
  Hits          529      529           
  Misses        136      136           
  Partials       65       65           

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