ci: update buildkit to 0.19.0

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

Author: crazy-max

.github/workflows/build.yml

@@ -54,7 +54,7 @@ jobs:
           - master
           - latest
           - buildx-stable-1
-          - v0.19.0-rc2
+          - v0.19.0
           - v0.18.2
           - v0.17.2
         worker: