Final retry for deleting elasticache security group

[ryndaniels]

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Reference #7873

Release note for CHANGELOG:

BUG FIXES:
* resource/aws_elasticache_security_group: Final retry after timeout when deleting elasticache security group

Output from acceptance testing:

$ TF_ACC=1 go test ./... -v -parallel 1 -run=TestAccAWSElasticacheSecurityGroup -timeout 120m
?       github.com/terraform-providers/terraform-provider-aws   [no test files]
=== RUN   TestAccAWSElasticacheSecurityGroup_basic
=== PAUSE TestAccAWSElasticacheSecurityGroup_basic
=== RUN   TestAccAWSElasticacheSecurityGroup_Import
=== PAUSE TestAccAWSElasticacheSecurityGroup_Import
=== CONT  TestAccAWSElasticacheSecurityGroup_basic
--- PASS: TestAccAWSElasticacheSecurityGroup_basic (24.46s)
=== CONT  TestAccAWSElasticacheSecurityGroup_Import
--- PASS: TestAccAWSElasticacheSecurityGroup_Import (24.74s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       49.993s

[bflad]

LGTM! 🚀 Merging so we can release this today.

--- PASS: TestAccAWSElasticacheSecurityGroup_basic (16.19s)
--- PASS: TestAccAWSElasticacheSecurityGroup_Import (18.38s)

[ghost]

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