build(deps): bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/conda.yaml

@@ -23,7 +23,7 @@ jobs:
       run:
         shell: bash -l {0}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: mamba-org/setup-micromamba@v1
         with:
           micromamba-version: "1.3.1-0"

.github/workflows/draft-pdf.yaml

@@ -6,7 +6,7 @@ jobs:
     name: Paper Draft
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Build draft PDF
         uses: openjournals/openjournals-draft-action@master
         with:

.github/workflows/main.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ${{ matrix.platform }}
     timeout-minutes: 45
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@v9
       - uses: DeterminateSystems/magic-nix-cache-action@v2
       - uses: cachix/cachix-action@v13
@@ -29,7 +29,7 @@ jobs:
     runs-on: ${{ matrix.platform }}
     timeout-minutes: 45
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@v9
       - uses: DeterminateSystems/magic-nix-cache-action@v2
       - uses: cachix/cachix-action@v13
@@ -44,7 +44,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [nix, poetry]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@v9
       - uses: DeterminateSystems/magic-nix-cache-action@v2
       - uses: cachix/cachix-action@v13
@@ -110,7 +110,7 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@v9
       - uses: DeterminateSystems/magic-nix-cache-action@v2
       - uses: cachix/cachix-action@v13