Implement dependabot updates for github actions

[e-backmark-ericsson]

Description

See example here: https://github.com/eiffel-community/eiffel/pull/367/files

Motivation

We need to have dependabot tracking our github actions files

Exemplification

NA

Benefits

.

Possible Drawbacks

.

[jainadc9]

eiffel-community/eiffel-intelligence#557
eiffel-community/eiffel-intelligence-frontend#318
eiffel-community/eiffel-remrem-publish#277
eiffel-community/eiffel-remrem-generate#217
eiffel-community/eiffel-remrem-semantics#165
eiffel-community/eiffel-remrem-protocol-interface#42
eiffel-community/eiffel-gerrit-plugin#61
eiffel-community/eiffel-jira-plugin#37
eiffel-community/eiffel-commons#54