chore: bump go version to 1.26 and upgrade dependencies

[rkettelerij]

Description

Bump:

• Go from 1.25 => 1.26, but stay compatible with Go 1.25 for downstream consumers for now (due to some buildpacks issues there)
• dependencies
• related tools such as golangci-lint and betteralign

Type of change

• Minor change (typo, formatting, version bump)

Checklist:

• I've double-checked the code in this PR myself
• I've left the code better than before (boy scout rule)
• The code is readable, comments are added that explain hard or non-obvious parts.
• I've expanded/improved the (unit) tests, when applicable
• I've run (unit) tests that prove my solution works
• There's no sensitive information like credentials in my PR

[rkettelerij]

Changed the PR to stay backwards compatible with Go 1.25. This is unfortunately necessary since some downstream consumers can't yet upgrade to Go 1.26.