Bump envoyproxy/envoy from v1.33-latest to v1.34-latest in /docker/envoy (#6158)

Bumps envoyproxy/envoy from v1.33-latest to v1.34-latest.

---
updated-dependencies:
- dependency-name: envoyproxy/envoy
  dependency-version: v1.34-latest
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docker/envoy/Dockerfile

@@ -1 +1 @@
-FROM envoyproxy/envoy:v1.33-latest
+FROM envoyproxy/envoy:v1.34-latest