Revert "Update source for Rust 1.66.1"

Revert submission 2421642-rust-update-prebuilts-1.66.1

Reason for revert: Missing riscv support and out of date base64 crate causing brekages

Reverted changes: /q/submissionid:2421642-rust-update-prebuilts-1.66.1

Change-Id: I4264f336e3651fbe4a9130921cbceb8fae01100a
6 files changed
tree: 216c41eddc834543e4e8e7248db65875e4a8d66d
  1. fuzzing/
  2. gdb/
  3. remote_provisioning/
  4. sanitizer-status/
  5. CleanSpec.mk
  6. OWNERS
  7. PREUPLOAD.cfg