r/aws_medialive_multiplex_program: deprecate statemux_settings attribute

[johnsonaj]

Description

Deprecate statemux_setting attribute

Relations

Closes #28190

References

Output from Acceptance Testing

$ make testacc TESTARGS='-run=TestAccMediaLive_serial/MultiplexProgram' PKG=medialive

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/medialive/... -v -count 1 -parallel 20  -run=TestAccMediaLive_serial/MultiplexProgram -timeout 180m
=== RUN   TestAccMediaLive_serial
=== PAUSE TestAccMediaLive_serial
=== CONT  TestAccMediaLive_serial
=== RUN   TestAccMediaLive_serial/MultiplexProgram
=== RUN   TestAccMediaLive_serial/MultiplexProgram/update
=== RUN   TestAccMediaLive_serial/MultiplexProgram/disappears
=== RUN   TestAccMediaLive_serial/MultiplexProgram/basic
--- PASS: TestAccMediaLive_serial (215.26s)
    --- PASS: TestAccMediaLive_serial/MultiplexProgram (215.26s)
        --- PASS: TestAccMediaLive_serial/MultiplexProgram/update (68.21s)
        --- PASS: TestAccMediaLive_serial/MultiplexProgram/disappears (86.02s)
        --- PASS: TestAccMediaLive_serial/MultiplexProgram/basic (61.03s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/medialive	218.425s

[github-actions]

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[github-actions]

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