Add missing file api/go1.26.txt

[bobg]

Fixes #33.

[github-actions]

Modver result

This report was generated by Modver,
a Go package and command that helps you obey semantic versioning rules in your Go module.

This PR does not require a change in your module’s version number.
(You might still consider bumping the patchlevel anyway.)

[coveralls]

Coverage Report for CI Build 24210143383

Coverage remained the same at 71.875%

Details

• Coverage remained the same as the base build.
• Patch coverage: 1 of 1 lines across 1 file are fully covered (100%).
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	1312
Covered Lines:	943
Line Coverage:	71.88%
Coverage Strength:	0.82 hits per line

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💛 - Coveralls