chore(deps): update nginx docker digest to bc5eac5 (#155)

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

.github/workflows/main.yml

@@ -111,7 +111,7 @@ jobs:
     # start nginx as service to test validation via http-challenge local path
     services:
       nginx:
-        image: nginx@sha256:28402db69fec7c17e179ea87882667f1e054391138f77ffaf0c3eb388efc3ffb
+        image: nginx@sha256:bc5eac5eafc581aeda3008b4b1f07ebba230de2f27d47767129a6a905c84f470
         volumes:
           - /tmp:/usr/share/nginx/html
         ports: