Drop support for mac x86 (#1716)

**Context:**
Jax dropped mac x86 since 0.5.0:
https://github.com/jax-ml/jax/blob/main/CHANGELOG.md#jax-050-jan-17-2025
As a result, we should drop it too if we want to update to latest jax. 

**Description of the Change:**
Drop catalyst support for mac x86.

**Benefits:**
Quicker CI; keeping up with jax versions. 

**Possible Drawbacks:**
Dropped support for a platform :(

Author: paul0403

.github/workflows/build-nightly-release.yaml

@@ -45,14 +45,9 @@ jobs:
     needs: [setup]
     uses: ./.github/workflows/build-wheel-macos-arm64.yaml
 
-  # macos-x86:
-  #   name: Build on macOS x86-64
-  #   needs: [setup]
-  #   uses: ./.github/workflows/build-wheel-macos-x86_64.yaml
-
   upload:
     name: Prepare & Upload wheels to TestPyPI
-    needs: [linux-x86, macos-arm, linux-aarch]  #, macos-x86
+    needs: [linux-x86, macos-arm, linux-aarch]
     runs-on: ubuntu-22.04
     permissions:
       id-token: write  # IMPORTANT: mandatory for trusted publishing
@@ -72,8 +67,6 @@ jobs:
       run: |
         rename "s/linux/manylinux_2_28/" dist/PennyLane_Catalyst-*
         rename "s/linux/manylinux_2_28/" dist/pennylane_catalyst-*
-        rename "s/macosx_13_0_universal2/macosx_13_0_x86_64/" dist/PennyLane_Catalyst-*
-        rename "s/macosx_13_0_universal2/macosx_13_0_x86_64/" dist/pennylane_catalyst-*
         rename "s/macosx_14_0_universal2/macosx_13_0_arm64/" dist/PennyLane_Catalyst-*
         rename "s/macosx_14_0_universal2/macosx_13_0_arm64/" dist/pennylane_catalyst-*
         rename "s/macosx_14/macosx_13/" dist/PennyLane_Catalyst-*