Fix CI (don't use 26.2.5 on Windows; be strict when comparing versions)

[paulo-ferraz-oliveira]

Description

1. remove Windows 26.2.5 from tests: (resolved) 26.2.5.2 is not installing properly, but the action's CI shouldn't be affected for this.

2. properly simulate version-type strict when required to not have e.g. 27.0 identify as (recently released) 27.0.1 when that's unexpected.

Motivation

The motivation for this change was the report in #298, which made me look into why we had issues with version resolution. (issue is not in code, but tests' expectations)

• [x] I have performed a self-review of my changes
• [x] I have read and understood the contributing guidelines

[paulo-ferraz-oliveira]

This is part of https://github.com/erlef/setup-beam/releases/tag/v1.18.1.