Update Dockerfile

Signed-off-by: Riddhesh Sanghvi <riddhesh237@gmail.com>

Dockerfile

@@ -15,8 +15,8 @@ ENV GOOS linux
 RUN go get -v ./...
 RUN go build -a -installsuffix cgo -ldflags '-w  -extldflags "-static"' -o /go/bin/slack-notify .
 
-# alpine:latest at 2020-01-18T01:19:37.187497623Z
-FROM alpine@sha256:ab00606a42621fb68f2ed6ad3c88be54397f981a7b70a79db3d1172b11c4367d
+# alpine:latest at 2023-08-23T11:48:25.468623934UTC
+FROM alpine@sha256:7144f7bab3d4c2648d7e59409f15ec52a18006a128c733fcff20d3a4a54ba44a
 
 COPY --from=builder /go/bin/slack-notify /usr/bin/slack-notify
 
@@ -25,14 +25,14 @@ ENV VAULT_VERSION 1.0.2
 RUN apk update \
 	&& apk upgrade \
 	&& apk add \
-	bash \
-	jq \
-	ca-certificates \
-	python \
-	py2-pip \
-	rsync && \
-	pip install shyaml && \
-	rm -rf /var/cache/apk/*
+		bash \
+		jq \
+		ca-certificates \
+		python3 \
+		py3-pip \
+		rsync \
+	&& pip3 install shyaml \
+	&& rm -rf /var/cache/apk/*
 
 # Setup Vault
 RUN wget https://releases.hashicorp.com/vault/${VAULT_VERSION}/vault_${VAULT_VERSION}_linux_amd64.zip && \