feat: switch to ovh provider for private subnet

[Libr4rian]

No description provided.

[fredleger]

this is related to #85
we must have a full change of ovh provider and indicate a breaking change in version number

[Copilot]

Pull request overview

Switches the ovh/pci-private-subnet Terraform module from managing subnets via the OpenStack provider to using the OVH provider’s ovh_cloud_project_network_private_subnet resource.

Changes:

• Replaced the OpenStack subnet resource with the OVH private subnet resource and updated outputs accordingly.
• Updated module inputs to match OVH subnet arguments (project/service name, region, CIDR, allocation range, DHCP/gateway toggles).
• Removed the OpenStack provider requirement and bumped the OVH provider constraint; updated generated README tables.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
ovh/pci-private-subnet/variables.tf	Reworked inputs for OVH subnet resource (project id, region, CIDR, start/end, DHCP flags).
ovh/pci-private-subnet/providers.tf	Dropped OpenStack provider and updated OVH provider version constraint.
ovh/pci-private-subnet/private-subnet.tf	Switched resource implementation from OpenStack subnet to OVH private subnet.
ovh/pci-private-subnet/outputs.tf	Updated outputs to reference the OVH subnet resource attributes.
ovh/pci-private-subnet/README.md	Updated generated provider/resource/input tables for OVH provider usage.

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