workspace: add Rust EFI infrastructure

This bumps rules_rust, cleans up the toolchains with the new version.
It also adds the Prost codegen to "normal" crate set as well as a new
crate set specific to EFI. This is separate because of Rust no-std's
dependence on create feature tags.

Change-Id: Ie76e66ee83696948391420ca3b011a3a71258690
Reviewed-on: https://review.monogon.dev/c/monogon/+/2202
Tested-by: Jenkins CI
Reviewed-by: Serge Bazanski <serge@monogon.tech>
diff --git a/third_party/rust/cargo/remote/BUILD.html5ever-0.26.0.bazel b/third_party/rust/cargo/remote/BUILD.html5ever-0.26.0.bazel
index 39f0798..010c720 100644
--- a/third_party/rust/cargo/remote/BUILD.html5ever-0.26.0.bazel
+++ b/third_party/rust/cargo/remote/BUILD.html5ever-0.26.0.bazel
@@ -55,9 +55,9 @@
     version = "0.26.0",
     visibility = ["//visibility:private"],
     deps = [
-        "@raze__proc_macro2__1_0_49//:proc_macro2",
-        "@raze__quote__1_0_23//:quote",
-        "@raze__syn__1_0_107//:syn",
+        "@raze__proc_macro2__1_0_67//:proc_macro2",
+        "@raze__quote__1_0_33//:quote",
+        "@raze__syn__1_0_109//:syn",
     ],
 )
 
@@ -91,7 +91,7 @@
     # buildifier: leave-alone
     deps = [
         ":html5ever_build_script",
-        "@raze__log__0_4_17//:log",
+        "@raze__log__0_4_20//:log",
         "@raze__mac__0_1_1//:mac",
         "@raze__markup5ever__0_11_0//:markup5ever",
     ],