Revert "workflows: pin install-nix-action to use nix 2.13.3"

This reverts commit 3563c178ca.

fixed in cachix/install-nix-action@v20

.github/workflows/basic-eval.yml

@@ -20,8 +20,6 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - uses: cachix/install-nix-action@v20
-      with:
-        install_url: https://releases.nixos.org/nix/nix-2.13.3/install
     - uses: cachix/cachix-action@v12
       with:
         # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.

.github/workflows/editorconfig.yml

@@ -33,7 +33,6 @@ jobs:
         # nixpkgs commit is pinned so that it doesn't break
         # editorconfig-checker 2.4.0
         nix_path: nixpkgs=https://github.com/NixOS/nixpkgs/archive/c473cc8714710179df205b153f4e9fa007107ff9.tar.gz
-        install_url: https://releases.nixos.org/nix/nix-2.13.3/install
     - name: Checking EditorConfig
       run: |
         cat "$HOME/changed_files" | nix-shell -p editorconfig-checker --run 'xargs -r editorconfig-checker -disable-indent-size'

.github/workflows/manual-nixos.yml

@@ -22,7 +22,6 @@ jobs:
         with:
           # explicitly enable sandbox
           extra_nix_config: sandbox = true
-          install_url: https://releases.nixos.org/nix/nix-2.13.3/install
       - uses: cachix/cachix-action@v12
         with:
           # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.

.github/workflows/manual-nixpkgs.yml

@@ -22,7 +22,6 @@ jobs:
         with:
           # explicitly enable sandbox
           extra_nix_config: sandbox = true
-          install_url: https://releases.nixos.org/nix/nix-2.13.3/install
       - uses: cachix/cachix-action@v12
         with:
           # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.

.github/workflows/manual-rendering.yml

@@ -22,7 +22,6 @@ jobs:
         with:
           # explicitly enable sandbox
           extra_nix_config: sandbox = true
-          install_url: https://releases.nixos.org/nix/nix-2.13.3/install
       - uses: cachix/cachix-action@v12
         with:
           # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.

.github/workflows/update-terraform-providers.yml

@@ -20,7 +20,6 @@ jobs:
       - uses: cachix/install-nix-action@v20
         with:
           nix_path: nixpkgs=channel:nixpkgs-unstable
-          install_url: https://releases.nixos.org/nix/nix-2.13.3/install
       - name: setup
         id: setup
         run: |