Bump armbian/build from 25.11.1 to 26.2.1

Bumps [armbian/build](https://github.com/armbian/build) from 25.11.1 to 26.2.1.
- [Release notes](https://github.com/armbian/build/releases)
- [Commits](armbian/build@v25.11.1...v26.2.1)

---
updated-dependencies:
- dependency-name: armbian/build
  dependency-version: 26.2.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/complete-artifact-one-by-one.yml

@@ -371,7 +371,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-      - uses: armbian/build@v26.2.1
+      - uses: armbian/build@v2021.05
         with:
           armbian_token:              "${{secrets.GITHUB_TOKEN}}"
           armbian_target:             "${{inputs.armbian_target}}"