Bump actions/checkout from 1 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 1 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v1...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/32bit-ci.yml

@@ -25,7 +25,7 @@ jobs:
         # Pin the GHC version: the i386/ubuntu:bionic container can't run the
         # deb10 i386 bindist that ghcup's "recommended" GHC moved to (see #596).
         curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | BOOTSTRAP_HASKELL_NONINTERACTIVE=1 BOOTSTRAP_HASKELL_INSTALL_NO_STACK=1 BOOTSTRAP_HASKELL_GHC_VERSION=9.6.7 sh
-    - uses: actions/checkout@v1 #This version must stay old enough to remain compatible with the container image
+    - uses: actions/checkout@v7 #This version must stay old enough to remain compatible with the container image
     - name: Test
       run: |
         source ~/.ghcup/env

.github/workflows/haskell-ci.yml

@@ -170,7 +170,7 @@ jobs:
           chmod a+x $HOME/.cabal/bin/cabal-plan
           cabal-plan --version
       - name: checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           path: source
       - name: initial cabal.project for sdist

.github/workflows/mhs-ci.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
 
     - name: checkout mhs repo
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
       with:
         repository: augustss/MicroHs
         ref: v0.14.23.1
@@ -23,7 +23,7 @@ jobs:
         make minstall
 
     - name: checkout unordered-containers repo
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
       with:
         path: unordered-containers
     - name: compile and install unordered-containers package