build(deps): Bump golang in /cmd/fluent-watcher/fluentbit (#607)

Bumps golang from 1.19.5-alpine3.16 to 1.20.2-alpine3.16.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

cmd/fluent-watcher/fluentbit/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.19.5-alpine3.16 as buildergo
+FROM golang:1.20.2-alpine3.16 as buildergo
 RUN mkdir -p /fluent-bit
 RUN mkdir -p /code
 COPY . /code/