fix: normalize gradlew.bat line endings to match .gitattributes

The Speakeasy SDK regeneration (cd26af9) committed gradlew.bat with
raw CRLF bytes in the Git object store. Since .gitattributes declares
`*.bat text eol=crlf`, Git converts to CRLF on checkout but can't
round-trip the already-CRLF stored content, causing a phantom diff
that `git restore` cannot clear.

Re-normalizing stores the file with LF in Git's object store, letting
the eol=crlf rule handle the working-tree conversion cleanly.

Author: chris-freeman-glean