chore: update stale bot duration to 90D

[mikeee]

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Issue reference

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://gentle-wave-0b831311e-4628.westus2.5.azurestaticapps.net

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://kind-hill-063ba6c1e-4628.westus2.5.azurestaticapps.net

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://gentle-wave-0b831311e-4628.westus2.5.azurestaticapps.net

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://kind-hill-063ba6c1e-4628.westus2.5.azurestaticapps.net

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://gentle-wave-0b831311e-4628.westus2.5.azurestaticapps.net

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://kind-hill-063ba6c1e-4628.westus2.5.azurestaticapps.net

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://gentle-wave-0b831311e-4628.westus2.5.azurestaticapps.net

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://kind-hill-063ba6c1e-4628.westus2.5.azurestaticapps.net