Release v0.2.6

[bernalde]

Summary

• Bump package version to v0.2.6.
• Use Julia package metadata for VERSION so version-only release bumps do not report a stale precompiled value.
• Remove the library TOML dependency, which was only used for manual version parsing.

Verification

• git diff --check
• julia --project=. -e "using Pkg; Pkg.test()"

[bernalde]

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