Update dependency earthly/earthly to v0.8.16 (#46)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ on:
     branches: [ main ]
 
 env:
-  EARTHLY_VERSION: v0.8.15 # renovate: datasource=github-tags depName=earthly/earthly
+  EARTHLY_VERSION: v0.8.16 # renovate: datasource=github-tags depName=earthly/earthly
 
 jobs:
   build: