Adds `permissions: contents: read` to the 10 workflows that had no
top-level permissions block. Workflows that already declared
permissions, or individual jobs that need elevated permissions (`issues:
write`, `pull-requests: write`, `contents: write`), are left unchanged.
Affected workflows: `dev.yml`, `java-publish.yml`, `java.yml`,
`license-header-check.yml`, `nodejs.yml`, `pypi-publish.yml`,
`python.yml`, `rust.yml`, `update_package_lock_run.yml`,
`update_package_lock_run_nodejs.yml`
