Bump build_runner from 2.4.11 to 2.4.12

[dependabot[bot]]

Bumps build_runner from 2.4.11 to 2.4.12.

Release notes

Sourced from build_runner's releases.

package:build_runner v2.4.12

• Bump the min sdk to 3.5.0-259.0.dev.
• Fix watch mode for workspace repos.

Commits

• cb92b01 release build_runner and build_runner_core (#3728)
• f038c9c allow 3.6.x sdks (#3724)
• 23b0f46 Bump actions/stale from 8.0.0 to 9.0.0 (#3633)
• b34704d build_daemon: drop pkg:uuid dev_dep (#3722)
• b3d3ef1 [WIP] Use workspaces (#3717)
• 9e6af3b fix deprecation warnings (#3720)
• f908080 Require analyzer 6.7.0, use FileSource. (#3719)
• See full diff in compare view

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[dependabot[bot]]

Looks like build_runner is up-to-date now, so this is no longer needed.