Update pins in MSRV CI

gethostname 1.0.1 has a MSRV of 1.64. Version 1.0.2 has an MSRV of 1.68.
We just updated to this MSRV, so we can use the newer version.

tracing-core has an MSRV of 1.65, so we can drop the pinning.

Signed-off-by: Uli Schlachter <psychon@znc.in>

Author: psychon

.github/workflows/CI.yml

@@ -178,9 +178,7 @@ jobs:
     - name: Pin last once_cell release supporting our msrv of Rust 1.68
       run: cargo update --package once_cell --precise 1.20.1
     - name: Pin last gethostname release supporting our msrv of Rust 1.68
-      run: cargo update --package gethostname --precise 1.0.1
-    - name: Pin last tracing-core release supporting our msrv of Rust 1.68
-      run: cargo update --package tracing-core --precise 0.1.33
+      run: cargo update --package gethostname --precise 1.0.2
     - name: Pin last libloading release supporting our msrv of Rust 1.68
       run: cargo update --package libloading --precise 0.8.8
     - name: Pin last async-io release supporting our msrv of Rust 1.68