build(deps): bump actions/download-artifact from 3 to 4

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/tiiuae-pixhawk-and-saluki.yaml

@@ -59,7 +59,7 @@ jobs:
           path: px4-firmware
           fetch-depth: 0
       - name: Download pixhawk artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: pixhawk
           path: bin
@@ -90,7 +90,7 @@ jobs:
           path: px4-firmware
           fetch-depth: 0
       - name: Download pixhawk artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: pixhawk
           path: bin
@@ -135,7 +135,7 @@ jobs:
           path: px4-firmware
           fetch-depth: 0
       - name: Download pixhawk artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: pixhawk
           path: bin
@@ -184,7 +184,7 @@ jobs:
       - fc_matrix
     steps:
       - name: Download pixhawk artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: pixhawk
           path: bin
@@ -263,7 +263,7 @@ jobs:
       - fc_matrix
     steps:
       - name: Download pixhawk artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: pixhawk
           path: bin