build: Bump gdbstub from 0.7.1 to 0.7.6

Bumps [gdbstub](https://github.com/daniel5151/gdbstub) from 0.7.1 to 0.7.6.
- [Release notes](https://github.com/daniel5151/gdbstub/releases)
- [Changelog](https://github.com/daniel5151/gdbstub/blob/master/CHANGELOG.md)
- [Commits](https://github.com/daniel5151/gdbstub/compare/0.7.1...0.7.6)

---
updated-dependencies:
- dependency-name: gdbstub
  dependency-version: 0.7.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Bo Chen <bchen@crusoe.ai>

Cargo.lock

@@ -824,9 +824,9 @@ dependencies = [
 
 [[package]]
 name = "gdbstub"
-version = "0.7.1"
+version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6341b3480afbb34eaefc7f92713bc92f2d83e338aaa1c44192f9c2956f4a4903"
+checksum = "71d66e32caf5dd59f561be0143e413e01d651bd8498eb9aa0be8c482c81c8d31"
 dependencies = [
  "bitflags 2.9.0",
  "cfg-if",