chore(deps): update dependency golangci/golangci-lint to v2.15.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
golangci/golangci-lint	uses-with	minor	v2.14.0 → v2.15.0

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Release Notes

golangci/golangci-lint

v2.15.0

Compare Source

Released on 2026-10-16

1. Linters new features or changes
   • errcheck: from 1.20.0 to 1.30.0
   • exhaustive: from 0.13.0 to 0.15.0 (⚠️ changes)
   • gocognit: from 1.2.1 to 1.3.0
   • golines: from 0.15.0 to 0.16.0
   • govet-modernize: from 0.50.0 to 0.52.0
   • loggercheck: from 0.12.0 to 0.13.0
   • predeclared: from 0.2.2 to 0.3.0
   • wrapcheck: from 2.12.0 to 2.13.0
2. Linters bug fixes
   • bidichk: from 0.3.3 to 0.3.4
   • canonicalheader: from a25c71c to e18e5c5
   • gofumpt: improve deprecation logs
   • gosec: improve concurrency default value
   • iface: from 1.5.1 to 1.5.3
   • paralleltest: from 1.0.15 to 1.0.16
   • revive: from 1.17.0 to 1.17.1
   • revive: the rules context-keys-type, errorf, modifies-value-receiver, range-val-address, string-of-int, time-equal, time-naming, unexported-return, unhandled-error, var-declaration are working (less randomly).
   • rowserrcheck: from c5f79b8 to e0740d5
   • staticcheck: from 0.8.1 to 0.8.2
3. Bug fixes
   • fix: compute custom version hash with module versions
   • fix: env vars loading (related to revive)

⚠️ Changes of the exhaustive linter:

• The replaced options still exists, and partially works, but they are deprecated.
• The options explicit-exhaustive-switch and explicit-exhaustive-map have been replaced by explicit-exhaustive.
• The check the value map has been replaced by mapliteral.
• The option ignore-enum-members (string) has been replaced by ignore-constants (slice).
• The option ignore-enum-types (string) has been replaced by ignore-types (slice).
• New report messages.
• The linter is a now a "slow" linter.

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[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.23%. Comparing base (c8a2dd2) to head (9b56ffc).

Files with missing lines	Patch %	Lines
server/internal/integrations/slack/socketmode.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #574      +/-   ##
==========================================
- Coverage   83.23%   83.23%   -0.01%     
==========================================
  Files        1207     1207              
  Lines      124148   124148              
==========================================
- Hits       103339   103335       -4     
- Misses      20800    20804       +4     
  Partials        9        9              

Files with missing lines	Coverage Δ
server/internal/checkers/checkimap/checker.go	77.99% <ø> (ø)
server/internal/checkers/checkpop3/checker.go	78.50% <ø> (ø)
server/internal/db/models/check_freshness.go	100.00% <100.00%> (ø)
server/internal/handlers/checks/importers/gatus.go	82.41% <ø> (ø)
server/internal/middleware/timeout.go	94.64% <100.00%> (ø)
server/internal/integrations/slack/socketmode.go	61.49% <50.00%> (ø)

... and 5 files with indirect coverage changes

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