fix: Dockerfile.client to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE317-OPENSSL-5776809
- https://snyk.io/vuln/SNYK-ALPINE317-OPENSSL-5776809
- https://snyk.io/vuln/SNYK-ALPINE317-OPENSSL-5788365
- https://snyk.io/vuln/SNYK-ALPINE317-OPENSSL-5788365
- https://snyk.io/vuln/SNYK-ALPINE317-OPENSSL-5821141

Dockerfile.client

@@ -1,14 +1,14 @@
 FROM mwader/static-ffmpeg:4.4.1 as ffmpeg
 
 # Go Binary Builder
-FROM golang:1.20.5-alpine3.17 as go-build
+FROM golang:1.21.0-alpine3.17 as go-build
 WORKDIR /app
 COPY . .
 RUN go get -v
 RUN go build -o streamdl
 
 # Golang Protobuf Client and Logic
-FROM golang:1.20.5-alpine3.17 as client
+FROM golang:1.21.0-alpine3.17 as client
 WORKDIR /app
 RUN mkdir -p /app/dl /app/out
 # Copy FFMPEG Binaries