Bump rubocop and rubocop-github

[HDinger]

Problem

Currently, on every PR the CI is failing on the gem:octicons_helper step when Linting with the following error: wrong number of arguments (given 5, expected 1). This happens due to the rubocop gem being outdated quite some bit.

Examples

See the currently opened PR:

• https://github.com/primer/octicons/actions/runs/6894514777/job/18756561098?pr=993
• https://github.com/primer/octicons/actions/runs/6509637913/job/17681662960?pr=983

Solution

The rubocop and the rubocop-github gems are updated to the current versions.

[changeset-bot[bot]]

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Latest commit: e69c0394d04bb468bae9f33e93e87e31963d8b89

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[github-actions[bot]]

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