Merge branch 'nh/normalOp' of github.com:JuliaImageRecon/LinearOperatorCollection.jl into nh/normalOp

Author: nHackel

.github/workflows/Breakage.yml

@@ -28,7 +28,7 @@ jobs:
         with:
           version: 1
           arch: x64
-      - uses: actions/cache@v1
+      - uses: actions/cache@v4
         env:
           cache-name: cache-artifacts
         with: