Bump cortex-m from 0.7.6 to 0.7.7 in /rtic_v0.5/stm32f0_hid_mouse

Bumps [cortex-m](https://github.com/rust-embedded/cortex-m) from 0.7.6 to 0.7.7.
- [Release notes](https://github.com/rust-embedded/cortex-m/releases)
- [Changelog](https://github.com/rust-embedded/cortex-m/blob/v0.7.7/CHANGELOG.md)
- [Commits](rust-embedded/cortex-m@v0.7.6...v0.7.7)

---
updated-dependencies:
- dependency-name: cortex-m
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

rtic_v0.5/stm32f0_hid_mouse/Cargo.lock

@@ -15,7 +15,7 @@ usbd-hid = "0.6.1"
 rtt-target = { version = "0.3.1", features = ["cortex-m"] }
 panic-halt = "0.2.0"
 panic-rtt-target = { version = "0.1.1", features = ["cortex-m"] }
-cortex-m = "0.7.6"
+cortex-m = "0.7.7"
 cortex-m-rtic = { version = "0.5.9", default-features = false, features = ["cortex-m-7"] }
 stm32f0xx-hal = { version = "0.18.0", features = ["rt", "stm32f042", "stm32-usbd"] }
 stm32-usbd = { version = "0.6.0" }