fix: default_resource_spec are actually optional

[mcanevet]

Description

default_resource_spec are actually not required in sagemaker_user_profiles.

[github-actions]

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[YakDriver]

LGTM 🎉

% make t T="TestAccSageMaker_serial/UserProfile" K=sagemaker
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/sagemaker/... -v -count 1 -parallel 20 -run='TestAccSageMaker_serial/UserProfile'  -timeout 180m
=== RUN   TestAccSageMaker_serial
=== PAUSE TestAccSageMaker_serial
=== CONT  TestAccSageMaker_serial
=== RUN   TestAccSageMaker_serial/UserProfile
=== RUN   TestAccSageMaker_serial/UserProfile/tags
=== RUN   TestAccSageMaker_serial/UserProfile/tensorboardAppSettingsWithImage
=== RUN   TestAccSageMaker_serial/UserProfile/jupyterServerAppSettings
=== RUN   TestAccSageMaker_serial/UserProfile/kernelGatewayAppSettings_lifecycleConfig
=== RUN   TestAccSageMaker_serial/UserProfile/kernelGatewayAppSettings_imageConfig
    user_profile_test.go:241: Environment variable SAGEMAKER_IMAGE_VERSION_BASE_IMAGE is not set
=== RUN   TestAccSageMaker_serial/UserProfile/basic
=== RUN   TestAccSageMaker_serial/UserProfile/disappears
=== RUN   TestAccSageMaker_serial/UserProfile/tensorboardAppSettings
=== RUN   TestAccSageMaker_serial/UserProfile/kernelGatewayAppSettings
--- PASS: TestAccSageMaker_serial (2284.99s)
    --- PASS: TestAccSageMaker_serial/UserProfile (2284.98s)
        --- PASS: TestAccSageMaker_serial/UserProfile/tags (398.73s)
        --- PASS: TestAccSageMaker_serial/UserProfile/tensorboardAppSettingsWithImage (277.60s)
        --- PASS: TestAccSageMaker_serial/UserProfile/jupyterServerAppSettings (271.25s)
        --- PASS: TestAccSageMaker_serial/UserProfile/kernelGatewayAppSettings_lifecycleConfig (262.32s)
        --- SKIP: TestAccSageMaker_serial/UserProfile/kernelGatewayAppSettings_imageConfig (0.00s)
        --- PASS: TestAccSageMaker_serial/UserProfile/basic (260.99s)
        --- PASS: TestAccSageMaker_serial/UserProfile/disappears (291.71s)
        --- PASS: TestAccSageMaker_serial/UserProfile/tensorboardAppSettings (261.14s)
        --- PASS: TestAccSageMaker_serial/UserProfile/kernelGatewayAppSettings (261.25s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/sagemaker	2287.048s

[github-actions]

This functionality has been released in v4.55.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.