Update operating system minimum version to Ubuntu 20.04

[MikeMcC399]

• relates to issue Operating System support lists vendor unsupported versions #5444

This PR updates the Ubuntu version in the list of supported operating systems under the section Getting Started > Installing Cypress > System requirements > Operating System

from

• Ubuntu 12.04 and above

to

• Ubuntu 20.04 and above

Background

Getting Started > Installing Cypress > System requirements > Node.js lists Node.js 18, 20 and above as being supported.

The Node.js 18 announcement provides detailed information in the Toolchain and Compiler Upgrades section which lists:

Prebuilt binaries for Linux are now built on Red Hat Enterprise Linux (RHEL) 8 and are compatible with Linux distributions based on glibc 2.28 or later, for example, Debian 10, RHEL 8, Ubuntu 20.04.

additionally it states:

Node.js does not support running on operating systems that are no longer supported by their vendor.

Node.js 18 > BUILDING.md lists more detailed information.

The release notes of Ubuntu 18.04.6 LTS (Bionic Beaver) include the text "WARNING: Release reached End of Life".

Ubuntu 20.04 LTS (Focal Fossa) is therefore the earliest version which is supported by Node.js 18 and is compatible with the prebuilt binaries of Node.js 18.

Attempting to run node or npm from Node.js 18.18.0 LTS on Ubuntu 18.04.6 LTS (Bionic Beaver) fails with the fatal error message:

node: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.28' not found (required by node)

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