chore(ci): pin npm 9.x in workflows

[dreamorosi]

Description of your changes

As discussed in the linked issue, npm recently reached version 10 which drops support for Node.js 14 and 16.

In order to continue running our CI, this PR pins the npm version to 9.x for all runtimes.

Related issues, RFCs

Issue number: closes #1665

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my change is effective and works
• The PR title follows the conventional commit semantics

Breaking change checklist

Is it a breaking change?: NO

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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[sonarqubecloud]

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