cargo: bump the patch group in /src/exercises/bare-metal/rtc with 1 update (google#1808)

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

Updates `chrono` from 0.4.33 to 0.4.34

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

@@ -9,7 +9,7 @@ publish = false
 [dependencies]
 arm-gic = "0.1.0"
 bitflags = "2.4.2"
-chrono = { version = "0.4.33", default-features = false }
+chrono = { version = "0.4.34", default-features = false }
 log = "0.4.17"
 smccc = "0.1.1"
 spin = "0.9.8"