fix: pin torchmetric until PSNR adjustment

[johannaSommer]

Description

After the release of torchmetrics 1.8.0 PSNR needs an additional data_range argument that needs to be implemented before upgrading to the latest version.

Related Issue

Fixes #(issue number)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Additional Notes

[simlang]

LGTM! quick "fix" for now, but should be addressed soon 👍