test_inject: fix localtime tests that depend on the current daylight saving time (#5583)

Which issue(s) this PR fixes: None.

What this PR does / why we need it: Three inject_values_to_record tests built the expected value with the current UTC offset, but they format a time on 2016-06-21. In a time zone with daylight saving time, the two offsets differ for half of the year.

The windows-11-arm runner uses Pacific time while the other runners use UTC (actions/runner-images#15007). So the windows-11-arm jobs fail on master since daylight saving time ended in the US on 2026-11-01 (e.g. https://github.com/fluent/fluentd/actions/runs/41312649082/job/124866099700). A fix on the runner side would not help developers who run the tests in such a time zone.

This PR uses the UTC offset of the test date instead.

Docs Changes: None.

Release Note: None. This only fixes the tests.

🤖 Generated with Claude Code

Signed-off-by: Shizuo Fujita fujita@clear-code.com Co-authored-by: Claude Opus 5.5 noreply@anthropic.com

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