Bump actions/checkout from 3 to 4 (#92)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v3...v4)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
         rust:
           - stable
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - uses: actions-rs/toolchain@v1
@@ -37,7 +37,7 @@ jobs:
           - stable
           - nightly
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - uses: actions-rs/toolchain@v1
@@ -57,7 +57,7 @@ jobs:
           - stable
           - nightly
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - uses: actions-rs/toolchain@v1
@@ -76,7 +76,7 @@ jobs:
         # "windows-latest" was removed; see https://github.com/ZcashFoundation/zcash_script/issues/38
         os: [ubuntu-latest, macOS-latest]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true
       # - name: install LLVM on Linux
@@ -122,7 +122,7 @@ jobs:
         rust:
           - stable
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - uses: actions-rs/toolchain@v1
@@ -143,7 +143,7 @@ jobs:
         rust:
           - stable
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - uses: actions-rs/toolchain@v1

.github/workflows/dependencies.yml

@@ -36,7 +36,7 @@ jobs:
     continue-on-error: ${{ matrix.checks == 'advisories' }}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           persist-credentials: false