Bump actions/checkout from 5 to 6 (#658)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  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>

Author: dependabot[bot]

.github/workflows/part_docs.yml

@@ -20,7 +20,7 @@ jobs:
       MIX_ENV: dev
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: erlef/setup-elixir@v1
         id: setupBEAM
         with:
@@ -60,7 +60,7 @@ jobs:
       contents: write
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/download-artifact@v7
         with:
           name: docs

.github/workflows/part_test.yml

@@ -22,7 +22,7 @@ jobs:
         with:
           egress-policy: audit
 
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
       - name: "Read .tool-versions"
         id: toolVersions
         run: |
@@ -43,7 +43,7 @@ jobs:
       MIX_ENV: dev
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: erlef/setup-elixir@v1
         id: setupBEAM
         with:
@@ -97,7 +97,7 @@ jobs:
       MIX_ENV: test
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: erlef/setup-elixir@v1
         id: setupBEAM
         with:
@@ -136,7 +136,7 @@ jobs:
       MIX_ENV: dev
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: erlef/setup-elixir@v1
         id: setupBEAM
         with:
@@ -169,7 +169,7 @@ jobs:
       DIALYZER_PLT_PRIV: true
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: erlef/setup-elixir@v1
         id: setupBEAM
         with:
@@ -214,7 +214,7 @@ jobs:
       DIALYZER_PLT_PRIV: true
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: erlef/setup-elixir@v1
         id: setupBEAM
         with: