Revert to older artifacat uploader and downloader

action/artifact-uploader@v4 has this breaking change:
```
Uploading to the same named Artifact multiple times.

Due to how Artifacts are created in this new version, it is no longer
possible to upload to the same named Artifact multiple times. You must
either split the uploads into multiple Artifacts with different names,
or only upload once. Otherwise you will encounter an error.
```

.github/workflows/benchmarks.yml

@@ -98,7 +98,7 @@ jobs:
         if: always()
         run: cp benchmarks/README_CI.md benchmarks.log .asv/results/
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v3
         if: always()
         with:
           name: asv-benchmark-results-${{ runner.os }}

.github/workflows/build_docs.yml

@@ -52,7 +52,7 @@ jobs:
           DEPLOY_KEY: ${{ secrets.DOC_DEPLOY_KEY_PRIVATE }}
           GIT_SSH_COMMAND: "ssh -o StrictHostKeyChecking=no"
       - name: Store docs as artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: docs
           path: doc/build/html

.github/workflows/nightly_wheel_build.yml

@@ -30,7 +30,7 @@ jobs:
     if: github.repository_owner == 'scikit-image' && github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v3
         id: download
         with:
           name: wheels

.github/workflows/wheel_tests_and_release.yml

@@ -35,7 +35,7 @@ jobs:
         run: |
           pip install twine
 
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v3
         id: download
         with:
           name: wheels

.github/workflows/wheels_recipe.yml

@@ -59,7 +59,7 @@ jobs:
           CIBW_MANYLINUX_I686_IMAGE: ${{ matrix.cibw_manylinux }}
           CIBW_ENVIRONMENT_PASS_LINUX: SKIMAGE_LINK_FLAGS
           SKIMAGE_LINK_FLAGS: "-Wl,--strip-debug"
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: ./dist/*.whl
@@ -99,7 +99,7 @@ jobs:
           CIBW_MANYLINUX_I686_IMAGE: ${{ matrix.cibw_manylinux }}
           CIBW_ENVIRONMENT_PASS_LINUX: SKIMAGE_LINK_FLAGS
           SKIMAGE_LINK_FLAGS: "-Wl,--strip-debug"
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: ./dist/*.whl
@@ -177,7 +177,7 @@ jobs:
           CIBW_MANYLINUX_I686_IMAGE: manylinux1
           CIBW_TEST_SKIP: "*-macosx_arm64"
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: ./dist/*.whl
@@ -235,7 +235,7 @@ jobs:
           # -Wl,-S equivalent to gcc's -Wl,--strip-debug
           LDFLAGS: "-Wl,-S"
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: ./dist/*.whl