doc/02-installation.md: remove outdated info

The Backports Repository is required for Debian 9, but we don't build even v10 anymore.
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Alexander Aleksandrovič Klimov 2024-08-21 12:09:27 +02:00 committed by GitHub
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@ -43,21 +43,6 @@ DIST=$(awk -F"[)(]+" '/VERSION=/ {print $2}' /etc/os-release); \
apt update
```
#### Debian Backports Repository <a id="debian-backports-repository"></a>
This repository is required for Debian Stretch since Icinga v2.11.
Debian Stretch:
```bash
DIST=$(awk -F"[)(]+" '/VERSION=/ {print $2}' /etc/os-release); \
echo "deb https://deb.debian.org/debian ${DIST}-backports main" > \
/etc/apt/sources.list.d/${DIST}-backports.list
apt update
```
<!-- {% endif %} -->
<!-- {% if ubuntu %} -->