fix(ci): update Dialyzer PLT cache key to include OTP/Elixir version

The PLT file is specific to the OTP and Elixir versions used. Updated
the cache key to include version info to prevent stale PLT errors.

Also removed deprecated --halt-exit-status flag and added explicit
priv/plts directory creation.

Author: GSMLG-BOT

.github/workflows/ci.yml

@@ -121,10 +121,15 @@ jobs:
 
       - name: Restore Dialyzer PLT cache
         uses: actions/cache@v4
+        id: plt-cache
         with:
           path: priv/plts
-          key: ${{ runner.os }}-dialyzer-${{ hashFiles('**/mix.lock') }}
-          restore-keys: ${{ runner.os }}-dialyzer-
+          key: ${{ runner.os }}-plt-otp28-elixir1.18-${{ hashFiles('**/mix.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-plt-otp28-elixir1.18-
+
+      - name: Create PLTs directory
+        run: mkdir -p priv/plts
 
       - name: Run Dialyzer
-        run: mix dialyzer --halt-exit-status
+        run: mix dialyzer