Remove temporary change using action from fix-docs-generation branch

The branch contained a step that cleans cache before running Docgen. We
wanted to verify if this will help for the random problems with docs
generation. It didn't help.

.github/workflows/contracts-docs.yml

@@ -39,7 +39,7 @@ jobs:
  github.event_name == 'pull_request'
  || github.event_name == 'push'
  || github.event_name == 'workflow_dispatch'
- uses: keep-network/ci/.github/workflows/reusable-solidity-docs.yml@fix-docs-generation # TODO: change to `main`
+ uses: keep-network/ci/.github/workflows/reusable-solidity-docs.yml@main
  with:
  projectDir: /solidity
  # We need to remove unnecessary `//` comment used in the `@dev`
@@ -64,7 +64,7 @@ jobs:
  needs: docs-detect-changes
  # TODO: remove last OR
  if: (github.event_name == 'release' && startsWith(github.ref, 'refs/tags/solidity/')) || github.ref == 'refs/pull/584/merge'
- uses: keep-network/ci/.github/workflows/reusable-solidity-docs.yml@fix-docs-generation # TODO: change to `main`
+ uses: keep-network/ci/.github/workflows/reusable-solidity-docs.yml@main
  with:
  projectDir: /solidity
  # We need to remove unnecessary `//` comment used in the `@dev`