Cannot install latest packages from apt in WSL (Ubuntu) [duplicate]

I have been trying to install python 3.10.4 from apt but it always keeps installing python 3.8.2. I ran sudo apt update and the output is following:

Hit:1 https://deb.nodesource.com/node_16.x focal InReleaseGet:2 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]Hit:3 http://archive.ubuntu.com/ubuntu focal InReleaseGet:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]Get:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB]Fetched 336 kB in 2s (146 kB/s)Reading package lists...Building dependency tree...Reading state information...1 package can be upgraded. Run 'apt list --upgradable' to see it.

The ppa listed above looks like the official ones (I am a linux newbie, I couldn't spot if anything was wrong here). Now if I run apt policy python3, I still get python 3.8.2, not the latest version which is 3.10.4.

python3:  Installed: (none)  Candidate: 3.8.2-0ubuntu2  Version table:     3.8.2-0ubuntu2 500        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages        100 /var/lib/dpkg/status

The problem also seems to occur for other packages. For example, the latest stable fzf version is 0.30.0, but running apt policy fzf, I get a much older version 0.20.0:

fzf:  Installed: (none)  Candidate: 0.20.0-1  Version table:     0.20.0-1 500        500 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages

The package version in apt might not be the absolute latest one so far I am concerned, but still should it lag by that much? How would I ensure that the packages I install from apt are the latest ones, if not then at least close to the latest version?