Use python3 pip module instead of pip binary

Focal only provides a pip3 binary, no pip3.8. Instead of working around
that with a symlink, use the module instead.

Add version information output for this variant.

Change-Id: I7af194ecc40e4d43c10ce067a661bb6ab4ca37d4
diff --git a/files/debs/general b/files/debs/general
index 2d8cd80..4bf1ff4 100644
--- a/files/debs/general
+++ b/files/debs/general
@@ -27,6 +27,7 @@
 pkg-config
 psmisc
 python3-dev
+python3-pip
 python3-venv
 tar
 tcpdump