ci(windows): use vcpkg to install openssl 3.4.1

[yihau]

Problem

slproweb doesn’t guarantee that libraries will be hosted indefinitely. if they remove any version unexpectedly, it could break our pipeline

Summary of Changes

• compile via vcpkg

note: this reverts the OpenSSL version bump I made in #6804 (from 3.4.1 -> 3.4.2). It’s also simpler for backports. we can bump master's version with another PR

[mergify]

Backports to the stable branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule.

[mergify]

Backports to the beta branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule. Exceptions include CI/metrics changes, CLI improvements and documentation updates on a case by case basis.

[mircea-c]

This LGTM