fix(telegraf): escape dollar in here-doc to prevent parameter expansion

[spike77453]

Escapes the dollar symbol in $basearch to prevent parameter expansion in the here-document.

Without escaping the baseurl parameter in the resulting file is malformed:

[influxdata]
name = InfluxData Repository - Stable
baseurl = https://repos.influxdata.com/stable//main
enabled = 1
gpgcheck = 1
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-influxdata

See also:

• docs-v2/content/shared/influxdb3/install.md

  Line 176 in 61a88db

  baseurl = https://repos.influxdata.com/stable/\$basearch/main

• docs-v2/content/influxdb3/clustered/reference/cli/influxctl/_index.md

  Line 183 in 61a88db

  baseurl = https://repos.influxdata.com/stable/\$basearch/main

• docs-v2/content/influxdb3/cloud-dedicated/reference/cli/influxctl/_index.md

  Line 195 in 61a88db

  baseurl = https://repos.influxdata.com/stable/\$basearch/main

• docs-v2/content/influxdb/v1/introduction/install.md

  Line 122 in 61a88db

  baseurl = https://repos.influxdata.com/rhel/\$releasever/\$basearch/stable

• Signed the InfluxData CLA
  (if necessary)
• Rebased/mergeable

[jstirnaman]

Thanks for submitting the PR!