fix: update riscv-rt to avoid yanked version

Even with the changes in esp-rs/esp-hal#350 creating a new project from the template for an esp32c3 produces a result that fails to build with:

```
error: failed to select a version for the requirement `riscv = "^0.9"`
candidate versions found which didn't match: 0.10.1, 0.8.0, 0.7.0, ...
location searched: crates.io index
required by package `riscv-rt v0.10.0`
    ... which satisfies dependency `riscv-rt = "^0.10"` of package `example_project v0.1.0 (/home/seth/Code/src/github.com/rustbox/esp-hal/example-project)`
```

Cargo.toml

@@ -16,7 +16,7 @@ esp-alloc = { version = "0.1.0", features = ["oom-handler"] }
 {%- endif %}
 esp-backtrace = { version = "0.4.0", features = ["{{ mcu }}", "panic-handler", "print-uart"] }
 {% if mcu == "esp32c3" -%}
-riscv-rt = { version = "0.10", optional = true }
+riscv-rt = { version = "0.10.1", optional = true }
 {%- else -%}
 {% if mcu == "esp32s2" -%}
 xtensa-atomic-emulation-trap = "0.3.0"