chore(docs): Reference the use of a pinned version

.github/workflows/test.yaml

@@ -6,7 +6,7 @@ on:
   workflow_dispatch:
 
 env:
-  TRIVY_VERSION: 0.52.2
+  TRIVY_VERSION: 0.51.1
   BATS_LIB_PATH: '/usr/lib/'
 
 jobs:

Dockerfile

@@ -1,4 +1,4 @@
-FROM ghcr.io/aquasecurity/trivy:0.52.2
+FROM ghcr.io/aquasecurity/trivy:0.51.1
 COPY entrypoint.sh /
 RUN apk --no-cache add bash curl npm
 RUN chmod +x /entrypoint.sh