chore(deps): bump envoy from 1.34.11 to 1.34.12 (backport of #15246) (#15259)

Automatic cherry-pick of #15246 for branch release-2.11

Generated by
[action](https://github.com/kumahq/kuma/actions/runs/20136708423)

cherry-picked commit 7656b4d

⚠️ ⚠️ ⚠️ Conflicts happened when cherry-picking!
⚠️ ⚠️ ⚠️
```
On branch release-2.11
Your branch is up to date with 'origin/release-2.11'.

You are currently cherry-picking commit 7656b4d.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   mk/dev.mk

no changes added to commit (use "git add" and/or "git commit -a")
```

---------

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Signed-off-by: Lukasz Dziedziak <lukidzi@gmail.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Lukasz Dziedziak <lukidzi@gmail.com>

Author: 3 people

mk/dev.mk

@@ -8,7 +8,7 @@ GIT_COMMIT = $(word 3, $(BUILD_INFO))
 BUILD_DATE = $(word 4, $(BUILD_INFO))
 CI_TOOLS_VERSION = $(word 5, $(BUILD_INFO))
 # renovate: datasource=github-tags depName=envoy packageName=kumahq/envoy-builds versioning=semver
-ENVOY_VERSION ?= 1.34.11
+ENVOY_VERSION ?= 1.34.12
 KUMA_CHARTS_URL ?= https://kumahq.github.io/charts
 CHART_REPO_NAME ?= kuma
 PROJECT_NAME ?= kuma