[Fix] fix restormer ut

[Z-Fran]

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Motivation

Ut failed on torch<1.8

Modification

Skip restormer ut on torch<1.8

Who can help? @ them here!

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with some of those projects.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Base: 88.11% // Head: 88.11% // No change to project coverage 👍

Coverage data is based on head (72aa051) compared to base (b13cd06).
Patch has no changes to coverable lines.

❗ Current head 72aa051 differs from pull request most recent head b68c5c5. Consider uploading reports for the commit b68c5c5 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           dev-1.x    #1550   +/-   ##
========================================
  Coverage    88.11%   88.11%           
========================================
  Files          386      386           
  Lines        24442    24442           
  Branches      3820     3820           
========================================
  Hits         21537    21537           
  Misses        2085     2085           
  Partials       820      820           

Flag	Coverage Δ
unittests	88.11% <ø> (ø)

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