Upgrade to Alpine Linux v3.19

Alpine v3.15 is out-of-date since 2023-11-01 and is not getting any security updates anymore: https://alpinelinux.org/releases/

Dockerfile

@@ -9,7 +9,7 @@ RUN go mod download
 COPY . .
 RUN CGO_ENABLED=0 GOOS=linux go build
 
-FROM alpine:3.15
+FROM alpine:3.19
 RUN apk add --no-cache -U git xdg-utils
 WORKDIR /go/src/github.com/jesseduffield/lazygit/
 COPY --from=build /go/src/github.com/jesseduffield/lazygit ./