workflows: Increase DT tools installation timeout

Increase the timeout for the toolchain installation in the
dtoverlaycheck workflow, to match that for the kernel.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

Author: pelwell

.github/workflows/dtoverlaycheck.yml

@@ -23,7 +23,7 @@ jobs:
       run: |
         sudo apt update
         sudo apt-get install gcc-arm-linux-gnueabihf libfdt-dev device-tree-compiler gnutls-dev
-      timeout-minutes: 10
+      timeout-minutes: 15
 
     - uses: actions/checkout@v4
       with: