finish cleaning up dependency bans job (#11059)

# Objective

- After #10151, cache check is less useful in dependency ban job
- It fails anyway because the steps are not in the right order

## Solution

- Remove the added steps

.github/workflows/dependencies.yml

@@ -29,36 +29,11 @@ jobs:
   check-bans:
     runs-on: ubuntu-latest
     steps:
-      # on main, prepare a new cargo tree output and cache it
-      - name: On main, prepare new cargo tree cache
-        if: github.ref == 'refs/heads/main'
-        run: cargo tree --depth 3 > cargo-tree-from-main
-      - name: On main, save the new cargo tree cache
-        if: github.ref == 'refs/heads/main'
-        uses: actions/cache/save@v3
-        with:
-          path: cargo-tree-from-main
-          key: cargo-tree-from-main    
-      # on other branch, restore the cached cargo tree output
-      - name: On PR, restore cargo tree cache
-        uses: actions/cache/restore@v3
-        if: github.ref != 'refs/heads/main'
-        with:
-          path: cargo-tree-from-main
-          key: cargo-tree-from-main
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
-      # if not on main, check that the cargo tree output is unchanged
-      - name: Check if the cargo tree changed from main
-        if: github.ref != 'refs/heads/main'
-        continue-on-error: true
-        id: cargo-tree-changed
-        run: diff cargo-tree-from-main <(cargo tree --depth 3)
       - name: Install cargo-deny
         run: cargo install cargo-deny
-      # if the check was not a success (either skipped because on main or failed because of a change), run the check
       - name: Check for banned and duplicated dependencies
-        if: steps.cargo-tree-changed.outcome != 'success'
         run: cargo deny check bans
 
   check-licenses: