Update dockerfile template base images (#5058)

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

Author: renovate[bot]

cmd/thv/app/inspector/version.go

@@ -7,4 +7,4 @@ package inspector
 // Image specifies the image to use for the inspector command.
 // TODO: This could probably be a flag with a sensible default
 // Pinning to a specific version for stability.
-var Image = "ghcr.io/modelcontextprotocol/inspector:0.21.1"
+var Image = "ghcr.io/modelcontextprotocol/inspector:0.21.2"

pkg/container/templates/go.tmpl

@@ -74,7 +74,7 @@ RUN package="{{.MCPPackage}}"; \
 {{end}}
 
 # Final stage - minimal runtime image
-FROM index.docker.io/library/alpine:3.23@sha256:25109184c71bdad752c8312a8623239686a9a2071e8825f20acb8f2198c3f659
+FROM index.docker.io/library/alpine:3.23@sha256:5b10f432ef3da1b8d4c7eb6c487f2f5a8f096bc91145e68878dd4a5019afde11
 
 {{if .CACertContent}}
 # Add custom CA certificate for runtime