chore(deps): pin dependencies

[vovinacci]

This PR contains the following updates:

Package	Update	Change
axllent/mailpit (source)	pinDigest	→ 5921fa3
grafana/loki	pinDigest	→ 70b9f69
postgres (source)	pinDigest	→ 57c72fd
prom/blackbox-exporter	pinDigest	→ 92e05d5
prometheuscommunity/postgres-exporter	pinDigest	→ ac5ec34

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This PR has been generated by Mend Renovate.

Summary by CodeRabbit

• Chores
  • Container images for Blackbox Exporter, Loki, Mailpit, PostgreSQL Exporter and PostgreSQL are now pinned to immutable SHA-256 digests.
  • Existing software versions remain unchanged, ensuring deployments use the intended image contents consistently.
  • This improves deployment reproducibility and reduces the risk of unexpected image changes between releases.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: a516ecdc-d845-4db3-82d2-810b5f5fda01

📥 Commits

Reviewing files that changed from the base of the PR and between 14a08e7 and 33dbacd.

📒 Files selected for processing (5)

• deploy/k8s/charts/blackbox/values.yaml
• deploy/k8s/charts/loki/values.yaml
• deploy/k8s/charts/mailpit/values.yaml
• deploy/k8s/charts/postgres-exporter/values.yaml
• deploy/k8s/charts/postgres/values.yaml

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Walkthrough

Five Kubernetes chart image tags now retain their versions and include immutable SHA-256 digests for Blackbox, Loki, Mailpit, postgres-exporter, and PostgreSQL.

Changes

Container image digest pinning

Layer / File(s)	Summary
Pin chart image tags deploy/k8s/charts/*/values.yaml	The five image tags now append SHA-256 digests to their existing version tags.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Poem

A rabbit checks each image line,
“Pinned and fixed, the tags now shine!”
Blackbox, Loki, Mailpit too,
Postgres tags are steady and true.
No drifting hops across the night.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: pinning dependency digests for the container images.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch renovate/pin-dependencies

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