Fix resource aws auth backend sts role

[chammock]

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Closes #1455

Release note for CHANGELOG:

`resource/aws_auth_backend_sts_role`: Add `ForceNew` behavior when updating `account_id`

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

make testacc TESTARGS='-run=TestAccAWSAuthBackendSTSRole'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test -v -run=TestAccAWSAuthBackendSTSRole -timeout 30m ./...
?       github.com/hashicorp/terraform-provider-vault   [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/coverage      [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/generate      [no test files]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/codegen   0.470s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/generated [no test files]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/datasources/transform/decode    0.790s [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/datasources/transform/encode    1.027s [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/resources/transform/alphabet    1.517s [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/resources/transform/role        0.560s [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/resources/transform/template    1.763s [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/resources/transform/transformation      1.268s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/helper    [no test files]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/internal/identity/entity  0.845s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/schema    [no test files]
?       github.com/hashicorp/terraform-provider-vault/testutil  [no test files]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/util      0.573s [no tests to run]
=== RUN   TestAccAWSAuthBackendSTSRole_import
--- PASS: TestAccAWSAuthBackendSTSRole_import (2.64s)
=== RUN   TestAccAWSAuthBackendSTSRole_basic
--- PASS: TestAccAWSAuthBackendSTSRole_basic (2.89s)
PASS
ok      github.com/hashicorp/terraform-provider-vault/vault     7.393s
...

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[Zlaticanin]

Hi @chammock, thank you so much for working on this! Could you please resolve the branch conflicts and sign the Contributor License Agreement?