build(deps): bump actions/checkout from v2.3.1 to v2.3.4

Bumps [actions/checkout](https://github.com/actions/checkout) from v2.3.1 to v2.3.4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.3.1...5a4ac90)

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/environments.yml

@@ -21,7 +21,7 @@ jobs:
         - rofi-unicode
         - keepass
     steps:
-    - uses: actions/checkout@v2.3.1
+    - uses: actions/checkout@v2.3.4
     - uses: cachix/install-nix-action@v12
       with:
         install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-2.4pre20210207_fd6eaa1/install
@@ -43,7 +43,7 @@ jobs:
         - tux-nixos
         - WS0005
     steps:
-    - uses: actions/checkout@v2.3.1
+    - uses: actions/checkout@v2.3.4
       with: { fetch-depth: 0 }
     - uses: cachix/install-nix-action@v12
       with: