fix(ci): fix native library commit workflow

[coreyhn]

This PR fixes the native library commit workflow by replacing the current commit action with actions/github-script for proper Base64 encoding while maintaining verified commits from the bot. This fixes binary corruption issues in the previous commit workflow as discussed in PR #9.

Additionally, this PR removes the .gitattributes file (from PR #8) since this is no longer needed due to the GitHub API bypassing git's text transformation logic.

It also updates artifact uploads when building native libraries to no longer include the READMEs, which will reduce upload size (albeit small) and keep the focus on what's required.

Lastly, it removes an unnecessary exclude rule from Cargo.toml for native library files that aren't present in the crates/protect-ffi directory.

[coreyhn]

Unlike as shown in PR #9, the built and committed libraries are now identical:

Before commit: platforms/darwin-x64/libprotect_ffi.dylib: Mach-O 64-bit dynamically linked shared library x86_64
After commit:  platforms/darwin-x64/libprotect_ffi.dylib: Mach-O 64-bit dynamically linked shared library x86_64

Before commit: 2861156 bytes
After commit:  2861156 bytes

# Before:
00000000  cf fa ed fe 07 00 00 01  03 00 00 00 06 00 00 00  |................|
00000010  10 00 00 00 88 08 00 00  85 00 90 00 00 00 00 00  |................|

# After
00000000  cf fa ed fe 07 00 00 01  03 00 00 00 06 00 00 00  |................|
00000010  10 00 00 00 88 08 00 00  85 00 90 00 00 00 00 00  |................|

Prebuilt libraries are, well as you'd expect, working now.