ci: update golangci-lint to v2.13.2

[apstndb]

Summary

• update the CI golangci-lint pin from v2.4 to v2.13.2
• keep the linter update separate from the GoReleaser scaffold work in build: clean up GoReleaser scaffold #789

CI continues to use the Go 1.25 toolchain, where golangci-lint v2.4 still works. Developers running the repository with Go 1.27 encounter a loader panic because v2.4 was built with an older Go version and cannot analyze Go 1.27 source. golangci-lint v2.13 added Go 1.27 support while remaining compatible with the CI toolchain.

Validation

• golangci-lint v2.13.2 version check
• golangci-lint fmt --diff .
• golangci-lint run --timeout=5m
• make check
• workflow YAML parse
• git diff --check origin/main...HEAD

[github-actions]

Code Metrics Report

📊 View detailed coverage report (available for 7 days)

	main (7b812c2)	#852 (32d6f19)	+/-
Coverage	74.2%	74.2%	0.0%
Code to Test Ratio	1:1.3	1:1.3	0.0
Test Execution Time	1m34s	1m55s	+21s

Details

  |                     | main (7b812c2) | #852 (32d6f19) | +/-  |
  |---------------------|----------------|----------------|------|
  | Coverage            |          74.2% |          74.2% | 0.0% |
  |   Files             |             94 |             94 |    0 |
  |   Lines             |           8106 |           8106 |    0 |
  |   Covered           |           6018 |           6018 |    0 |
  | Code to Test Ratio  |          1:1.3 |          1:1.3 |  0.0 |
  |   Code              |          18902 |          18902 |    0 |
  |   Test              |          26439 |          26439 |    0 |
- | Test Execution Time |          1m34s |          1m55s | +21s |

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Reported by octocov