build(deps): bump vergen from 3.2.0 to 4.2.0

[dependabot]

Bumps vergen from 3.2.0 to 4.2.0.

Release notes

Sourced from vergen's releases.

v4.2.0

• gen -> vergen. Deprecated gen entry point as a result of the ConstantsFlags deprecation.
• ConstantsFlags -> Config. ContantsFlags was growing bloated and needed some extra logic, so migrated to a Config style.
• Added some more configuration around date/time handling. You can now specify Local vs. UTC for time, and can output date only, time only, timestamp only, or and combination of the three, for date related instructions.

v4.1.0

• Added cargo feature to allow getting the target triple, profile, and current feature set at build time.
• Updated some documentation

v4.0.3

• Updated rustc_version dependency to be at least version 0.3.1 to avoid compilation issues with llvm_version which was added then.

v4.0.2

• Removed some transitive dependencies from the git2 crate (specifically openssl-sys) via the default-features = false flag to allow for running on more diverse systems.

v4.0.1

• Documentation updates

v4.0.0

Release 4.0 Breaking Changes

• The main entry point for use has changed from generate_cargo_keys to gen
• There are now 3 features that allow you to control what instructions can be generated (build, git, and rustc).
  • The build feature enables the VERGEN_BUILD_* instructions.
  • The git feature enables the VERGEN_GIT_* instructions, the cargo:rerun-if-changed instructions, and the REBUILD_ON_HEAD_CHANGE flag.
  • The rustc feature enables the VERGEN_RUSTC_* instructions.
  • By default, all three features are enabled.
  • You can build with all three features disabled, which basically make the gen function a no-op.
  • You can still use ConstantsFlags to toggle individual cargo instructions.
• The generated instructions have been normalized. Therefore, you may need to update what env variable you are referring to in code. I've included a list below of the full set of instructions that can be generated for reference.

cargo:rustc-env=VERGEN_BUILD_DATE=2021-02-12
cargo:rustc-env=VERGEN_BUILD_TIMESTAMP=2021-02-12T01:54:15.134750+00:00
cargo:rustc-env=VERGEN_GIT_BRANCH=feature/git2
cargo:rustc-env=VERGEN_GIT_COMMIT_DATE=2021-02-11T20:05:53-05:00
cargo:rustc-env=VERGEN_GIT_SEMVER=v3.2.0-86-g95fc0f5
cargo:rustc-env=VERGEN_GIT_SEMVER_LIGHTWEIGHT=blah-33-g95fc0f5
cargo:rustc-env=VERGEN_GIT_SHA=95fc0f5d066710f16e0c23ce3239d6e040abca0d
cargo:rustc-env=VERGEN_GIT_SHA_SHORT=95fc0f5
cargo:rustc-env=VERGEN_RUSTC_CHANNEL=nightly
cargo:rustc-env=VERGEN_RUSTC_COMMIT_DATE=2021-02-10
cargo:rustc-env=VERGEN_RUSTC_COMMIT_HASH=07194ffcd25b0871ce560b9f702e52db27ac9f77
cargo:rustc-env=VERGEN_RUSTC_HOST_TRIPLE=x86_64-apple-darwin
cargo:rustc-env=VERGEN_RUSTC_LLVM_VERSION=11.0
cargo:rustc-env=VERGEN_RUSTC_SEMVER=1.52.0-nightly
cargo:rerun-if-changed=/Users/yoda/projects/rust-lang/vergen/.git/HEAD
cargo:rerun-if-changed=/Users/yoda/projects/rust-lang/vergen/.git/refs/heads/feature/git2

• Under the hood, the Commands used for git have been removed in lieu of using the git2 library directly.

... (truncated)

Commits

• 66d6b66 version bump for next release (#52)
• d42d9ed added no-op test
• 1ccfcec testing
• f3a07a4 Replace ConstantsFlags with Config (#51)
• f49246c Re-order some things
• 854ca20 Added thiserror library (#49)
• 59c6402 README.md update
• da21546 README.md update
• 90a9f1a Release 4.1.0 (#48)
• 60e1e39 Added a cargo feature to expose some cargo env variable (#47)
• Additional commits viewable in compare view

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[teor2345]

Duplicate of #1741

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.