Bump version and changelog for v3.84.0

[DrJosh9000]

v3.84.0 (2024-10-28)

Full Changelog

Added

• Add command for canceling a running a build #2958 (@dannymidnight)
• Add tini-static to alpine images #3054 (@DrJosh9000)

Fixed

• Implement several documentation improvements to the Agent (for the Buildkite Docs). #3043 (@gilesgas)
• Allow token to be empty if graphql-token is provided #3051 (@jordandcarter)
• Fix multiline secret redaction when output with \r\n #3050 (@DrJosh9000)
• k8s exec: Perform liveness check of clients #3045 (@DrJosh9000)
• Fix request headers for multipart #3042 (@DrJosh9000)

Internal

• install.sh tidyups #3032 (@DrJosh9000)
• Parallel container image uploads #3035 (@DrJosh9000)
• Various dependency bumps: #3058, #3026, #3055, #3056, #3048, #3047, #3049, #3036, #3041, #3040, #3037, #3039 (@dependabot[bot])

[wolfeidau]

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