chore(deps): update terraform proxmox to v0.68.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
proxmox (source)	required_provider	minor	0.67.1 -> 0.68.0

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Release Notes

bpg/terraform-provider-proxmox (proxmox)

v0.68.0

Compare Source

Features

• node: add support for node config API (#​1482) (3e025fd)
• vm: add bz2 (bzip2) as a valid download file compression algorithm (#​1655) (e29dc53)

Bug Fixes

• vm: add retries to VM update operation (#​1650) (d92710d)

Miscellaneous

• ci: remove mergify config (#​1652) (45eede7)
• ci: update qodana config (#​1653) (6dad660)
• deps: update module github.com/golangci/golangci-lint (v1.62.0 → v1.62.2) in /tools (#​1657) (826b406)
• deps: update module github.com/stretchr/testify (v1.9.0 → v1.10.0) (#​1654) (7967299)

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