chore(deps): update riscv requirement from 0.14.0 to 0.15.0

Updates the requirements on [riscv](https://github.com/rust-embedded/riscv) to permit the latest version.
- [Release notes](https://github.com/rust-embedded/riscv/releases)
- [Commits](rust-embedded/riscv@v0.14.0...riscv-v0.15.0)

---
updated-dependencies:
- dependency-name: riscv
  dependency-version: 0.15.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

rtic-monotonics/Cargo.toml

@@ -69,7 +69,7 @@ imxrt-ral = { version = "0.6.1", optional = true }
 
 esp32c3 = {version = "0.30.0", optional = true }
 esp32c6 = {version = "0.21.0", optional = true }
-riscv = {version = "0.14.0", optional = true }
+riscv = {version = "0.15.0", optional = true }
 
 [build-dependencies]
 proc-macro2 = { version = "1.0.36", optional = true }

rtic/Cargo.toml

@@ -28,7 +28,7 @@ name = "rtic"
 riscv-slic = { version = "0.2.0", optional = true }
 esp32c3 = { version = "0.30.0", optional = true }
 esp32c6 = { version = "0.21.0", optional = true }
-riscv = { version = "0.14.0", optional = true }
+riscv = { version = "0.15.0", optional = true }
 cortex-m = { version = "0.7.0", optional = true }
 bare-metal = "1.0.0"
 portable-atomic = { version = "1", default-features = false }