ci: bump loongarch64-linux timeouts by 1 hour

https://codeberg.org/ziglang/zig/actions/runs/611/jobs/5/attempt/1

.forgejo/workflows/ci.yaml

@@ -66,7 +66,7 @@ jobs:
           fetch-depth: 0
       - name: Build and Test
         run: sh ci/loongarch64-linux-debug.sh
-        timeout-minutes: 240
+        timeout-minutes: 300
   loongarch64-linux-release:
     runs-on: [self-hosted, loongarch64-linux]
     steps:
@@ -76,7 +76,7 @@ jobs:
           fetch-depth: 0
       - name: Build and Test
         run: sh ci/loongarch64-linux-release.sh
-        timeout-minutes: 180
+        timeout-minutes: 240
 
   powerpc64le-linux-debug:
     runs-on: [self-hosted, powerpc64le-linux]