Bump actions/checkout from 3 to 4 (#148)

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](actions/checkout@v3...v4)

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

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

Author: dependabot[bot]

.github/workflows/rust.yml

@@ -12,7 +12,7 @@ jobs:
     name: README Format Check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: docker://ghcr.io/msrd0/cargo-doc2readme:nightly
         with:
           entrypoint: cargo
@@ -23,7 +23,7 @@ jobs:
     name: Style Check (clippy)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/[email protected]
         with:
           components: clippy
@@ -37,7 +37,7 @@ jobs:
     name: Style Checks (rustfmt)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@nightly
         with:
           components: rustfmt
@@ -67,7 +67,7 @@ jobs:
             nightly: true
         os: [ubuntu-latest, windows-latest, macOS-latest]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{matrix.rust.toolchain}}
@@ -129,7 +129,7 @@ jobs:
           DOCKER_INFLUXDB_INIT_BUCKET: mydb
           DOCKER_INFLUXDB_INIT_ADMIN_TOKEN: admintoken
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{matrix.rust.toolchain}}
@@ -169,7 +169,7 @@ jobs:
           INFLUXDB_USER_PASSWORD: password
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         id: rust-toolchain
       - name: Get Tarpaulin Version
@@ -214,7 +214,7 @@ jobs:
       - coverage
     if: github.ref == 'refs/heads/main'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: gh-pages
       - uses: actions/download-artifact@v4