chore(deps): update nginx docker tag to v18.3.6

[renovate]

This PR contains the following updates:

Package	Update	Change
nginx (source)	minor	18.2.5 -> 18.3.6

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Release Notes

bitnami/charts (nginx)

v18.3.6

• [bitnami/nginx] Release 18.3.6 (#​31797)

v18.3.5

• [bitnami/nginx] Release 18.3.5 (#​31299)

v18.3.4

• [bitnami/nginx] Release 18.3.4 (#​31265) (4a91230), closes #​31265

v18.3.3

• [bitnami/nginx] Release 18.3.3 (#​31248) (f4f89f6), closes #​31248

v18.3.2

• [bitnami/*] Fix typo in README (#​31052) (b41a51d), closes #​31052
• [bitnami/nginx] Release 18.3.2 (#​31191) (a921fd9), closes #​31191

v18.3.1

• [bitnami/nginx] fix nginx init containers with writable file system (#​30810) (4688b13), closes #​30810

v18.3.0

• [bitnami/*] Add Bitnami Premium to NOTES.txt (#​30854) (3dfc003), closes #​30854
• [bitnami/*] docs: 📝 Add "Backup & Restore" section (#​30711) (35ab536), closes #​30711
• [bitnami/*] docs: 📝 Add "Prometheus metrics" (batch 5) (#​30674) (ed2a546), closes #​30674
• [bitnami/*] docs: 📝 Unify "Securing Traffic using TLS" section (#​30707) (b572333), closes #​30707
• [bitnami/nginx] Detect non-standard images (#​30907) (aca39b5), closes #​30907

v18.2.6

• [bitnami/nginx] Release 18.2.6 (#​30632) (b0b23d2), closes #​30632

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[Mokto]

👋 Hi, @renovate,
I detected conflicts against the base branch 🙊
You'll want to sync 🔄 your branch with upstream!

[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: charts/sentry/Chart.lock

Command failed: helm registry login --username mdpprodrenovate --password **redacted** registry-1.docker.io/bitnamicharts
WARNING: Using --password via the CLI is insecure. Use --password-stdin.
Error: invalid reference: invalid registry "registry-1.docker.io/bitnamicharts"