Bump the actions group with 3 updates

Bumps the actions group with 3 updates: [actions/checkout](https://github.com/actions/checkout), [mamba-org/setup-micromamba](https://github.com/mamba-org/setup-micromamba) and [actions/download-artifact](https://github.com/actions/download-artifact).


Updates `actions/checkout` from 4 to 5
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

Updates `mamba-org/setup-micromamba` from 1 to 2
- [Release notes](https://github.com/mamba-org/setup-micromamba/releases)
- [Commits](mamba-org/setup-micromamba@v1...v2)

Updates `actions/download-artifact` from 4 to 5
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: mamba-org/setup-micromamba
  dependency-version: '2'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: actions/download-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

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

Author: dependabot[bot]

.github/workflows/codespell.yml

@@ -4,5 +4,5 @@ jobs:
   codespell:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: codespell-project/actions-codespell@v2.1

.github/workflows/doc.yml

@@ -25,9 +25,9 @@ jobs:
       CXX: "ccache ${{ matrix.compiler }}"
       CXXFLAGS: "-O2 -g"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: "Create micromamba environment"
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-name: libsemigroups
           create-args: >-

.github/workflows/tests.yml

@@ -27,9 +27,9 @@ jobs:
       CXX: "ccache ${{ matrix.compiler }}"
       CXXFLAGS: "-O2 -g"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: "Create micromamba environment"
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-name: libsemigroups
           create-args: >-

.github/workflows/wheels.yml

@@ -22,7 +22,7 @@ jobs:
         os: [ubuntu-latest, ubuntu-24.04-arm, macos-13, macos-14]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       # Used to host cibuildwheel
       - name: Build wheel
@@ -38,7 +38,7 @@ jobs:
     name: Make source distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Install libsemigroups
         run: source etc/make-libsemigroups.sh && sudo make install
       - name: Build SDist
@@ -67,7 +67,7 @@ jobs:
 
     steps:
       - name: Download wheels and sdist artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v5
         with:
           # Here, we could specify a name of an artifact, or a pattern that
           # matches the names of artifacts. However, by not specifying these