add stable-2.13 in test matrix

[rrey]

Relates to ansible-collections/news-for-maintainers#14

[codecov]

Codecov Report

Merging #238 (115677d) into main (9b52973) will increase coverage by 3.49%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #238      +/-   ##
==========================================
+ Coverage   68.76%   72.25%   +3.49%     
==========================================
  Files          16       12       -4     
  Lines        1700     1521     -179     
  Branches      287      267      -20     
==========================================
- Hits         1169     1099      -70     
+ Misses        398      289     -109     
  Partials      133      133              

Flag	Coverage Δ
integration	67.14% <ø> (ø)
sanity	?
units	73.40% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
plugins/modules/grafana_plugin.py	25.47% <0.00%> (-2.84%)	⬇️
plugins/modules/grafana_organization.py	83.09% <0.00%> (-1.41%)	⬇️
plugins/modules/grafana_folder.py	74.74% <0.00%> (-1.02%)	⬇️
plugins/modules/grafana_datasource.py	73.96% <0.00%> (-0.60%)	⬇️
plugins/modules/grafana_notification_channel.py	57.07% <0.00%> (-0.49%)	⬇️
plugins/modules/grafana_dashboard.py	47.05% <0.00%> (-0.40%)	⬇️
plugins/lookup/grafana_dashboard.py
plugins/doc_fragments/api_key.py
plugins/callback/grafana_annotations.py
plugins/doc_fragments/basic_auth.py

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[CWollinger]

Maybe also include grafana version 8.4 in the integration tests?

[Andersson007]

my script detects there there's no stable-2.13, so automatically created #238
Fixes #238