chore(deps): update caddy:2.9.1-alpine docker digest to b4e3952 (#34)

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

Author: renovate[bot]

Dockerfile

@@ -2,6 +2,6 @@ FROM caddy:2.9.1-builder-alpine@sha256:a7da868cc556e38e6003f7129db24c9a29ceceee9
 
 RUN xcaddy build --with github.com/caddy-dns/cloudflare
 
-FROM caddy:2.9.1-alpine@sha256:b6894cfcec924873db96df564b7dabc2dee938c79d4d87c05fec463b18b63aa2
+FROM caddy:2.9.1-alpine@sha256:b4e3952384eb9524a887633ce65c752dd7c71314d2c2acf98cd5c715aaa534f0
 
 COPY --from=builder /usr/bin/caddy /usr/bin/caddy