feat(deps): update renovate/renovate docker tag to v31.15.0

This MR contains the following updates:

Package	Update	Change
renovate/renovate	minor	31.14.1 -> 31.15.0
renovate/renovate	minor	31.14.0-slim -> 31.15.0-slim

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Release Notes

renovatebot/renovate

v31.15.0

Features

• preset: Add sentry-dotnet monorepo (#​13340) (f43a40f)

Tests

• Refactor snapshot-only test cases (#​13324) (f7869e1)

Miscellaneous Chores

• deps: lock file maintenance (#​13331) (f7b7ec5)
• deps: update dependency conventional-changelog-conventionalcommits to v4.6.2 (#​13323) (69bada9)
• deps: update dependency re2 to v1.17.2 (#​13329) (b6ede9a)

Code Refactoring

• Add more strict null checks (#​13332) (f0906eb)

Documentation

• local development: add refactor MR test note (#​13335) (64e5c70)
• self-hosting: update renovate/renovate refs (#​13339) (5d513a9)
• simplify text, use monospace for versions (#​13338) (10088e1)
• update references to renovate/renovate to v31.14.1 (#​13330) (df77a50)
• use cases: simplify text (#​13337) (fb05c4c)

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