chore(deps): update golang docker tag to v1.19 (#266)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| golang | stage | minor | `1.18-alpine` -> `1.19-alpine` |

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build.Dockerfile

@@ -1,6 +1,6 @@
 # Main Dockerfile for flagd builds
 # Build the manager binary
-FROM --platform=$BUILDPLATFORM golang:1.18-alpine AS builder
+FROM --platform=$BUILDPLATFORM golang:1.19-alpine AS builder
 
 WORKDIR /workspace
 ARG TARGETOS

profile.Dockerfile

@@ -1,6 +1,6 @@
 # Dockerfile with pprof profiler
 # Build the manager binary
-FROM --platform=$BUILDPLATFORM golang:1.18-alpine AS builder
+FROM --platform=$BUILDPLATFORM golang:1.19-alpine AS builder
 
 WORKDIR /workspace
 ARG TARGETOS