Fix npm audit findings, adjust test harness

[stephenyeargin]

This pull request modernizes dependencies, improves test reliability, and refactors the Grafana bot command handlers for better async/await usage. The most important changes are summarized below.

Dependency and Tooling Updates

• Updated hubot and several dev dependencies in package.json, replacing nyc with c8 for code coverage, and adjusted the test script accordingly. Also added overrides for diff and serialize-javascript to address potential security or compatibility concerns. [1] [2]

Grafana Bot Async Refactor

• Refactored all Grafana bot command handlers in src/grafana.js to use async/await instead of .then() for improved readability and error handling. This affects dashboard, alert, and search commands. [1] [2] [3] [4]

Test Infrastructure Improvements

• Replaced the hubot-mock-adapter dependency with a custom MockAdapter implementation in test/common/MockAdapter.js, and updated test bot setup in test/common/TestBot.js to use this adapter. [1] [2] [3]
• Improved the test bot's message sending and response waiting logic to ensure async correctness and reliability in tests. [1] [2]

[Copilot]

Pull request overview

This PR updates the project’s Node/Hubot tooling and test harness to address audit findings and improve reliability, while also refactoring Grafana command handlers to use async/await for clearer async control flow.

Changes:

• Updated dev dependencies (Hubot 14, Mocha 11) and replaced nyc with c8 for coverage reporting.
• Replaced hubot-mock-adapter with a custom in-repo MockAdapter and adjusted the test bot harness async flow.
• Refactored multiple src/grafana.js Hubot responders from .then(...) chains to async/await.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
package.json	Bumps Hubot/dev tooling versions, switches coverage tooling to c8, and adds overrides to address audit items.
package-lock.json	Updates the dependency graph to match the dependency/tooling upgrades and overrides.
src/grafana.js	Converts several command handlers to async/await for simpler async logic.
test/common/TestBot.js	Updates the test harness to use the new mock adapter and tweaks async send/wait behavior.
test/common/MockAdapter.js	Adds a minimal Hubot adapter implementation for tests, replacing the external mock-adapter dependency.

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