fix(mongodbflex): fixed wrong dailySnapshotRetentionDays parameter

[j1n-o9r]

Description

Acc tests for Mongodbflex are failing:

➜  terraform-provider-stackit git:(main) ✗ TF_ACC=1 go test -v ./stackit/internal/services/mongodbflex/mongodbflex_acc_test.go
=== RUN   TestAccMongoDBFlexFlexResource
    mongodbflex_acc_test.go:110: Step 1/5 error: Error running apply: exit status 1
        
        Error: Error creating instance
        
          with stackit_mongodbflex_instance.instance,
          on terraform_plugin_test.tf line 17, in resource "stackit_mongodbflex_instance" "instance":
          17:                           resource "stackit_mongodbflex_instance" "instance" {
        
        Updating options: 400 Bad Request, status code 400, Body: {"message":"error
        validating
        parameters","code":400,"type":"Validation","fields":{"dailySnapshotRetentionDays":["daily
        snapshot retention days must be one of: [0 3 4 5 6 7 15 30 60 90]"]}}
        
        
        Trace ID: "adf460d1e13cf723b74d2e2c86ea1e84"
--- FAIL: TestAccMongoDBFlexFlexResource (439.29s)
FAIL
FAIL    command-line-arguments  439.900s
FAIL

relates to STACKITTPR-663

Checklist

• Issue was linked above
• Code format was applied: make fmt
• Examples were added / adjusted (see examples/ directory)
• Docs are up-to-date: make generate-docs (will be checked by CI)
• Unit tests got implemented or updated
• Acceptance tests got implemented or updated (see e.g. here)
• Unit tests are passing: make test (will be checked by CI)
• No linter issues: make lint (will be checked by CI)

[github-actions]

Merging this branch will not change overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/mongodbflex	0.00% (ø)

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Coverage by file

Changed unit test files

• github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/mongodbflex/mongodbflex_acc_test.go