Bump actions/download-artifact from 4 to 5

Bumps [actions/download-artifact](https://github.com/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/download-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -66,7 +66,7 @@ jobs:
           cp bmtool.exe build/
           cp mkinitrd.exe build/
       - name: Download README.pdf
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v5
         with:
           name: README.pdf
           path: build

Makefile

@@ -1,6 +1,6 @@
 # Versioning information
 #
-VERSION := v3.0.6
+VERSION := v3.0.7
 WIMBOOT_VERSION := v2.8.0
 SBAT_GENERATION := 1