Add Rust 1.93.0 to the Rust version blocklist. (#1653)

### Change summary

Rust 1.93.0 has a bug in the wasm32-wasip2 target, so it doesn't affect
current Fastly users, however there are potential future use cases
affected by it, so add a blocklist rule for it.

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* [x] Have you followed the guidelines in our Contributing document?
* [x] Have you checked to ensure there aren't other open [Pull
Requests](https://github.com/fastly/cli/pulls) for the same
update/change?

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### User Impact

Users using Rust 1.93.0 will need to upgrade to Rust 1.93.1.

---------

Co-authored-by: Kevin P. Fleming <kpfleming@users.noreply.github.com>

Author: dgohman-fastly

.fastly/config.toml

@@ -18,7 +18,11 @@ toolchain_constraint = ">= 1.21"           # Go toolchain constraint for use wit
 toolchain_constraint_tinygo = ">= 1.18"    # Go toolchain constraint for use with TinyGo.
 
 [language.rust]
-toolchain_constraint = ">= 1.78 != 1.91.0" # Rust 1.91.0 produces broken WASM packages which crash when handling requests
+# * Rust 1.91.0 has a bug where it produces broken wasm packages which crash
+#   when handling requests; the bug is fixed in Rust 1.91.1.
+# * Rust 1.93.0 has a bug on wasm32-wasip2 where it leaks file descriptors in
+#   `std::fs::File`; the bug is fixed in Rust 1.93.1.
+toolchain_constraint = ">= 1.78 != 1.91.0 != 1.93.0"
 wasm_wasi_target = "wasm32-wasip1"
 
 [wasm-tools]

CHANGELOG.md

@@ -110,6 +110,7 @@ both the old and new forms are:
 - feat(service/resourcelink): moved the `resource-link` commands under the `service` command, with an unlisted and deprecated alias of `resource-link` ([#1635](https://github.com/fastly/cli/pull/1635))
 - feat(service/logging): moved the `logging` commands under the `service` command, with an unlisted and deprecated alias of `logging` ([#1642](https://github.com/fastly/cli/pull/1642))
 - feat(service/auth): moved the `service-auth` commands under the `service` command and renamed to `auth`, with an unlisted and deprecated alias of `service-auth` ([#1643](https://github.com/fastly/cli/pull/1643))
+- feat(compute/build): Block version 1.93.0 of Rust to avoid a wasm32-wasip2 bug. ([#1653](https://github.com/fastly/cli/pull/1653))
 
 ### Bug fixes: