cargo-tree is already part of cargo. Use that instead

Signed-off-by: Hanif Bin Ariffin <hanif.ariffin.4326@gmail.com>

.github/workflows/FixPR.yml

@@ -4,8 +4,6 @@ name: FixPR
 
 # Trigger automated fixes for PRs being merged (with associated commits)
 
-# ToDO: [2021-06; rivy] change from `cargo-tree` to `cargo tree` once MSRV is >= 1.45
-
 env:
   BRANCH_TARGET: main
 
@@ -45,14 +43,6 @@ jobs:
         toolchain: ${{ steps.vars.outputs.RUST_MIN_SRV }}
         default: true
         profile: minimal # minimal component installation (ie, no documentation)
-    - name: Install `cargo-tree` # for dependency information
-      uses: actions-rs/install@v0.1
-      with:
-        crate: cargo-tree
-        version: latest
-        use-tool-cache: true
-      env:
-        RUSTUP_TOOLCHAIN: stable
     - name: Ensure updated 'Cargo.lock'
       shell: bash
       run: |
@@ -73,12 +63,12 @@ jobs:
         rustup show active-toolchain
         cargo -V
         rustc -V
-        cargo-tree tree -V
+        cargo tree -V
         ## dependencies
         echo "## dependency list"
         cargo fetch --locked --quiet
         ## * using the 'stable' toolchain is necessary to avoid "unexpected '--filter-platform'" errors
-        RUSTUP_TOOLCHAIN=stable cargo-tree tree --locked --all --no-dev-dependencies --no-indent --features ${{ matrix.job.features }} | grep -vE "$PWD" | sort --unique
+        RUSTUP_TOOLCHAIN=stable cargo tree --locked --all --no-dev-dependencies --no-indent --features ${{ matrix.job.features }} | grep -vE "$PWD" | sort --unique
     - name: Commit any changes (to '${{ env.BRANCH_TARGET }}')
       uses: EndBug/add-and-commit@v9
       with: