Update for Elixir 1.17 and OTP 27.2

[jbosse]

Summary by Sourcery

Update project to Elixir 1.17 and OTP 27.2, and bump the version to 0.3.0. Update the installation instructions in the README to reflect the new version requirement.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the project to support Elixir 1.17 and OTP 27.2. It also updates the elixlsx dependency to ~> 0.6 and bumps the project version to 0.3.0. The README is updated with installation instructions for the new version.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Updated Elixir and OTP versions	Updated Elixir version to ~> 1.17 in mix.exs Added installation instructions for Elixir 1.17+ to README.md	mix.exs README.md
Updated elixlsx dependency	Updated elixlsx dependency to ~> 0.6 in mix.exs Updated mix.lock file to reflect the dependency change	mix.exs mix.lock
Updated project version	Bumped project version to 0.3.0 in mix.exs	mix.exs
Fixed zip creation path	Converted writer.temp_dir to charlist before passing it to :zip.create/3	lib/elixlsx_writer.ex

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[sourcery-ai]

Hey @jbosse - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟡 Testing: 1 issue found
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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