cargo: bump bitflags from 2.6.0 to 2.8.0 in /src/exercises/bare-metal/rtc in the minor group (#2617)

Bumps the minor group in /src/exercises/bare-metal/rtc with 1 update:
[bitflags](https://github.com/bitflags/bitflags).

Updates `bitflags` from 2.6.0 to 2.8.0

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/exercises/bare-metal/rtc/Cargo.lock

@@ -8,7 +8,7 @@ publish = false
 
 [dependencies]
 arm-gic = "0.1.2"
-bitflags = "2.6.0"
+bitflags = "2.8.0"
 chrono = { version = "0.4.39", default-features = false }
 log = "0.4.22"
 smccc = "0.1.1"