8 files declare their use of FieldStorageDefinitionUpdateForbiddenException

EntityDefinitionUpdateTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php
FieldSqlStorageTest.php in core/tests/Drupal/KernelTests/Core/Entity/FieldSqlStorageTest.php
FieldStorageCrudTest.php in core/modules/field/tests/src/Kernel/FieldStorageCrudTest.php
field_test.field.inc in core/modules/field/tests/modules/field_test/field_test.field.inc
Defines a field type and its formatters and widgets.
options.module in core/modules/options/options.module
Defines selection, check box and radio button widgets for text and numeric fields.
OptionsFieldTest.php in core/modules/options/tests/src/Kernel/OptionsFieldTest.php
SqlContentEntityStorageSchema.php in core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchema.php
SqlContentEntityStorageSchemaColumnTest.php in core/modules/field/tests/src/Kernel/Entity/Update/SqlContentEntityStorageSchemaColumnTest.php

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