Fix Redshift semgrep prefer-aws-go-sdk-pointer-conversion-conditional errors

[ewbankkit]

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Relates: #12992.

Fixes:

Findings:

  internal/service/redshift/security_group.go 
     prefer-aws-go-sdk-pointer-conversion-conditional
        Prefer AWS Go SDK pointer conversion functions for dereferencing during conditionals, e.g.
        aws.StringValue()

        244┆ *resp.ClusterSecurityGroups[0].ClusterSecurityGroupName != d.Id() {


  internal/service/redshift/snapshot_schedule_association.go 
     prefer-aws-go-sdk-pointer-conversion-conditional
        Prefer AWS Go SDK pointer conversion functions for dereferencing during conditionals, e.g.
        aws.StringValue()

        108┆ if *cluster.ClusterIdentifier == clusterIdentifier {

% make testacc TESTARGS='-run=TestAccRedshiftSnapshotScheduleAssociation_basic\|TestAccRedshiftSecurityGroup_basic' PKG=redshift
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/redshift/... -v -count 1 -parallel 20  -run=TestAccRedshiftSnapshotScheduleAssociation_basic\|TestAccRedshiftSecurityGroup_basic -timeout 180m
=== RUN   TestAccRedshiftSecurityGroup_basic
=== PAUSE TestAccRedshiftSecurityGroup_basic
=== RUN   TestAccRedshiftSnapshotScheduleAssociation_basic
=== PAUSE TestAccRedshiftSnapshotScheduleAssociation_basic
=== CONT  TestAccRedshiftSecurityGroup_basic
=== CONT  TestAccRedshiftSnapshotScheduleAssociation_basic
--- PASS: TestAccRedshiftSecurityGroup_basic (15.14s)
--- PASS: TestAccRedshiftSnapshotScheduleAssociation_basic (279.77s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/redshift	286.719s

[github-actions]

This functionality has been released in v4.13.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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