Update Terraform exoscale to ~> 0.25

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
exoscale (source)	required_provider	minor	~> 0.23 -> ~> 0.25

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Release Notes

exoscale/terraform-provider-exoscale

### [`v0.25.0`](https://togithub.com/exoscale/terraform-provider-exoscale/blob/master/CHANGELOG.md#​0250-July-2-2021) [Compare Source](https://togithub.com/exoscale/terraform-provider-exoscale/compare/v0.24.0...v0.25.0) IMPROVEMENTS: - `exoscale_sks_nodepool`: add support for Deploy Target/Instance Prefix - `exoscale_compute`/`exoscale_instance_pool`: improve cloud-init userdata handling BUG FIXES: - `exoscale_security_group_rule*`: support -1 value for `icmp_(code|type)` - Fix non-existence detection logic for NLB service/SKS Nodepool ### [`v0.24.0`](https://togithub.com/exoscale/terraform-provider-exoscale/blob/master/CHANGELOG.md#​0240-May-11-2021) [Compare Source](https://togithub.com/exoscale/terraform-provider-exoscale/compare/v0.23.0...v0.24.0) DEPRECATIONS: - `exoscale_sks_cluster`: the `addons` parameter is deprecated and replaced by `exoscale_ccm`/`metrics_server` CHANGES: - `exoscale_sks_cluster`: use latest available version advertised by the API by default IMPROVEMENTS: - `exoscale_instance_pool`: add support for Deploy Targets - `exoscale_instance_pool`: add support for instance prefix - `exoscale_instance_pool`: add support for `ipv6` attribute resetting

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