v0.8.4

What's Changed

• [CI] Bump github/codeql-action from 3.26.11 to 3.26.12 by @dependabot in #1848
• [CI] Bump actions/upload-artifact from 4.4.0 to 4.4.1 by @dependabot in #1849
• [CI] Bump actions/checkout from 4.2.0 to 4.2.1 by @dependabot in #1850
• [ci] Stop rolling toolchains on the 0.7 branch by @joshlf in #1851
• Fix roll-pinned-toolchain-versions by @joshlf in #1840
• [ci] Roll pinned nightly toolchain by @google-pr-creation-bot in #1857
• [CI] Bump actions/upload-artifact from 4.4.1 to 4.4.2 by @dependabot in #1858
• [ci] Roll pinned nightly toolchain by @google-pr-creation-bot in #1861
• [CI] Bump actions/upload-artifact from 4.4.2 to 4.4.3 by @dependabot in #1862
• [doc] Advise err.to_string() to address lifetime issues by @jswrenn in #1864
• Release 0.8.4 by @google-pr-creation-bot in #1868

Full Changelog: v0.8.3...v0.8.4