fix(util): use vim.ui.open to open uri

[80avin]

fixes #1947

Description

In WSL, pressing K over a commit id or URL in the :Lazy window gives error

E5108: Error executing lua: Vim:E475: Invalid value from argument cmd: 'open' is not executable

Implementing the Util.open using vim.ui.open fixes this issue, however I've only tested it on windows.
Let me know if there is any concern that I could be missing.

Related Issue(s)

Fixes #1947

Screenshots

NA

[nenahp]

vim.ui.open require neovim 0.10.0+ while I find this in README

Neovim >= 0.8.0 (needs to be built with LuaJIT)

[80avin]

I'll change.
Btw, I noticed that calling explorer.exe with the url opens the URL in default browser.
Therefore, on 0.10.0+, we can use vim.ui.open and on older, we can use explorer.exe instead of wslview as wslview is not present by default and isn't listed in healthcheck also.