build(deps): Bump alpine in /cmd/fluent-watcher/fluentd

Bumps alpine from 3.19 to 3.20.

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

Signed-off-by: dependabot[bot] <support@github.com>

cmd/fluent-watcher/fluentd/Dockerfile.amd64

@@ -8,7 +8,7 @@ RUN echo $(ls -al /code)
 RUN CGO_ENABLED=0 go build -ldflags '-w -s' -o /fluentd/fluentd-watcher /code/cmd/fluent-watcher/fluentd/main.go
 
 # Fluentd main image
-FROM alpine:3.19
+FROM alpine:3.20
 LABEL Description="Fluentd docker image" Vendor="Fluent Organization" Version="1.17.0"
 
 # Do not split this into multiple RUN!