feat(tvix/eval): Forbid Hash{Map,Set}, use Fx instead

Per https://nnethercote.github.io/perf-book/hashing.html, we have
basically no reason to use the default hasher over a faster,
non-DoS-resistant hasher. This gives a nice perf boost basically for
free:

hello outpath           time:   [704.76 ms 714.91 ms 725.63 ms]
                        change: [-7.2391% -6.1018% -4.9189%] (p = 0.00 < 0.05)
                        Performance has improved.

Change-Id: If5587f444ed3af69f8af4eead6af3ea303b4ae68
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12046
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>
Autosubmit: aspen <root@gws.fyi>

tvix/Cargo.lock

@@ -3085,7 +3085,7 @@ dependencies = [
  "pin-project-lite",
  "quinn-proto",
  "quinn-udp",
- "rustc-hash",
+ "rustc-hash 1.1.0",
  "rustls 0.23.7",
  "thiserror",
  "tokio",
@@ -3101,7 +3101,7 @@ dependencies = [
  "bytes",
  "rand",
  "ring",
- "rustc-hash",
+ "rustc-hash 1.1.0",
  "rustls 0.23.7",
  "slab",
  "thiserror",
@@ -3416,7 +3416,7 @@ dependencies = [
  "countme",
  "hashbrown 0.14.3",
  "memoffset 0.9.0",
- "rustc-hash",
+ "rustc-hash 1.1.0",
  "text-size",
 ]
 
@@ -3473,6 +3473,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
 
+[[package]]
+name = "rustc-hash"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "583034fd73374156e66797ed8e5b0d5690409c9226b22d87cb7f19821c05d152"
+
 [[package]]
 name = "rustc_version"
 version = "0.4.0"
@@ -4864,6 +4870,7 @@ dependencies = [
  "nix-compat",
  "rnix",
  "rowan",
+ "rustc-hash 2.0.0",
  "rustyline",
  "smol_str",
  "thiserror",
@@ -4905,6 +4912,7 @@ dependencies = [
  "rnix",
  "rowan",
  "rstest",
+ "rustc-hash 2.0.0",
  "serde",
  "serde_json",
  "sha1",