chore(deps): update alpine docker tag to v3.14 (#85)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

Dockerfile

@@ -5,7 +5,7 @@
 
 # TODO: Using alpine for now due to easier installation of skopeo
 #       Will use distroless after incorporating skopeo into the webhook directly
-FROM alpine:3.13
+FROM alpine:3.14
 RUN apk add --no-cache --repository=http://dl-cdn.alpinelinux.org/alpine/edge/community "skopeo>=1.2.0"
 
 COPY k8s-image-swapper /