Bump BrianPugh/install-micropython from 2 to 3

[dependabot]

Bumps BrianPugh/install-micropython from 2 to 3.

Release notes

Sourced from BrianPugh/install-micropython's releases.

v3.0.0

Breaking changes

• The action now runs on the node24 runtime. GitHub-hosted runners are unaffected; self-hosted runners must be v2.327.1 or newer.
• The cflags input now applies only to the micropython Unix port build, not to mpy-cross. mpy-cross's fixed feature configuration fails to compile with many otherwise-valid MicroPython feature flags; its meaningful options (target architecture, emitter, optimization level) are runtime CLI flags and are unaffected. CFLAGS_EXTRA is still exported to all subsequent steps of the job.
• The MicroPython repository is cloned to os.homedir()/micropython instead of a hardcoded /home/runner/micropython. This is unchanged on GitHub-hosted runners; on self-hosted runners, use the MPY_DIR environment variable rather than a hardcoded path.

New features

• New outputs: cache-hit ('true'/'false') and sha (the resolved MicroPython commit SHA), useful for keying your own caches off the exact MicroPython version.
• New submodules input (default true): submodules are now initialized even on cache hits, so MPY_DIR works for natmod-style builds on warm runs (previously these passed on the first run and failed on cached re-runs). Set to false to make cached runs ~30 seconds faster if you only need the micropython/mpy-cross binaries.
• Tag references are fetched with a fast shallow clone; branches and commit SHAs use a full clone so the built interpreter reports an accurate git describe-based version string.

Fixes

• Git commands are invoked with argument arrays, preventing argument injection via the repository/reference inputs.
• A cache-save race between concurrent jobs building the same configuration no longer fails an otherwise-successful build.
• Build parallelism comes from os.cpus() instead of nproc, for self-hosted portability.

Full Changelog: BrianPugh/install-micropython@v2...v3.0.0

v2.4.0

Maintenance release — no runtime or input changes. Workflows on @v2 need no updates. Upgraded the GitHub Actions toolkit (@actions/cache 6.1.0, @actions/core 3.0.1, @actions/exec/@actions/io 2.0.0) and@vercel/ncc 0.44.0; migrated to ESM (#43).

Full Changelog: BrianPugh/install-micropython@v2...v2.4.0

v2.3.0

What's Changed

• Bump @​vercel/ncc from 0.38.1 to 0.38.3
• Bump @​actions/core from 1.10.1 to 1.11.1
• Bump @​actions/cache from 3.2.4 to 4.0.0

Full Changelog: BrianPugh/install-micropython@v2...v2.3.0

v2.2.0

What's Changed

• Allow user to specify cflags. by @​BrianPugh in BrianPugh/install-micropython#16

Full Changelog: BrianPugh/install-micropython@v2...v2.2.0

v2.1.0

Features

• Add ${MPY_DIR}/mpy-cross/build/mpy-cross to the cache paths; some tools (somewhat) inappropriately hardcode this location for the mpy-cross executable.

Full Changelog: BrianPugh/install-micropython@v2.0.0...v2.1.0

Commits

• 2edec0d Prepare v3.0.0: point README at @​v3, bump package version
• e891801 Merge pull request #51 from BrianPugh/action-improvements
• 97319fb Don't apply user cflags to the mpy-cross build
• cb0f6a2 Declare node globals in eslint config
• 86faf93 Use MICROPY_PY_SYS_TRACEBACKLIMIT as the cflags test flag
• 582029f Bump actions/checkout and actions/setup-node to v5
• e5a7e7b Fix cflags test: MICROPY_MEM_STATS needs MICROPY_MALLOC_USES_ALLOCATED_SIZE
• 1f7edfc Document CFLAGS_EXTRA export scope in README
• fb4253e Update CLAUDE.md for current architecture
• 02663a6 Expand test coverage: branch refs, cache restores, cflags, submodules
• Additional commits viewable in compare view

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