ci: fix dev build cleanup race between Go and Rust workflows

Both workflows trigger on push to master and race to delete assets
from the same dev release. When one deletes assets the other is also
trying to delete, the "Not Found" error fails the cleanup job and
skips all downstream build jobs.

Add continue-on-error to both cleanup steps since the error is
harmless — build steps already use overwrite: true.

.github/workflows/binaries_dev.yml

@@ -18,6 +18,7 @@ jobs:
 
       - name: Delete old release assets
         uses: mknejp/delete-release-assets@v1
+        continue-on-error: true
         with:
           token: ${{ github.token }}
           tag: dev

.github/workflows/rust_binaries_dev.yml

@@ -19,6 +19,7 @@ jobs:
     steps:
       - name: Delete old Rust volume dev assets
         uses: mknejp/delete-release-assets@v1
+        continue-on-error: true
         with:
           token: ${{ github.token }}
           tag: dev