all: Bumps minimum Golang version to 1.18

[Shaptic]

What

Go 1.19 is out, so we should support 1.18 and 1.19.

Why

We support the two latest stable Golang versions.

Known limitations

n/a

[Shaptic]

Ew wtf who approved this go fmt change

[Shaptic]

lol awesome, ./gofmt.sh and ./gogenerate.sh are now incompatible with each other because of this change 😒 investigating...

[Shaptic]

Awesome, looks like azure.archive.ubuntu.com is down:

Err:1 http://azure.archive.ubuntu.com/ubuntu focal/universe amd64 git-restore-mtime all 2019.11-1
  Could not connect to azure.archive.ubuntu.com:80 (52.252.75.106), connection timed out
E: Failed to fetch http://azure.archive.ubuntu.com/ubuntu/pool/universe/g/git-mestrelion-tools/git-restore-mtime_2019.11-1_all.deb  Could not connect to azure.archive.ubuntu.com:80 (52.252.75.106), connection timed out
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Error: Process completed with exit code 100.