ci: fix HIP/MUSA kvarn build break and bump deprecated Node 20 actions

kvarn.cu's profiling helpers use cudaEventDefault and cudaEventElapsedTime, which were never added to the CUDA->HIP/MUSA vendor shims. This broke the Ubuntu ROCm and Windows HIP release builds with 'use of undeclared identifier' errors. Add the two missing event mappings to hip.h and musa.h.

Also bump the three Node 20 actions in the local ccache composite actions to their Node 24 majors ahead of the 2026-06-16 enforcement: actions/cache/restore@v4 -> v5, actions/cache/save@v4 -> v5, actions/github-script@v7 -> v8.

Author: Anbeeld

.github/actions/save-rolling-ccache/action.yml

@@ -43,7 +43,7 @@ runs:
         fi
 
     - name: Delete previous cache
-      uses: actions/github-script@v7
+      uses: actions/github-script@v8
       env:
         CACHE_KEY: ${{ inputs.key }}
         CACHE_REF: ${{ inputs.ref }}
@@ -85,7 +85,7 @@ runs:
             : `Deleted ${deleted} previous cache entr${deleted === 1 ? "y" : "ies"} for ${key} on ${ref}.`);
 
     - name: Save refreshed cache
-      uses: actions/cache/save@v4
+      uses: actions/cache/save@v5
       with:
         path: ${{ steps.ccache-path.outputs.path }}
         key: ${{ inputs.key }}

.github/actions/setup-ccache/action.yml

@@ -75,7 +75,7 @@ runs:
 
     - name: Restore ccache
       id: restore-cache
-      uses: actions/cache/restore@v4
+      uses: actions/cache/restore@v5
       with:
         path: ${{ steps.ccache-path.outputs.path }}
         key: ${{ inputs.key }}

ggml/src/ggml-cuda/vendors/hip.h

@@ -77,7 +77,9 @@
 #define cudaErrorPeerAccessAlreadyEnabled hipErrorPeerAccessAlreadyEnabled
 #define cudaErrorPeerAccessNotEnabled hipErrorPeerAccessNotEnabled
 #define cudaEventCreateWithFlags hipEventCreateWithFlags
+#define cudaEventDefault hipEventDefault
 #define cudaEventDisableTiming hipEventDisableTiming
+#define cudaEventElapsedTime hipEventElapsedTime
 #define cudaEventRecord hipEventRecord
 #define cudaEventSynchronize hipEventSynchronize
 #define cudaEvent_t hipEvent_t

ggml/src/ggml-cuda/vendors/musa.h

@@ -48,7 +48,9 @@
 #define cudaErrorPeerAccessAlreadyEnabled musaErrorPeerAccessAlreadyEnabled
 #define cudaErrorPeerAccessNotEnabled musaErrorPeerAccessNotEnabled
 #define cudaEventCreateWithFlags musaEventCreateWithFlags
+#define cudaEventDefault musaEventDefault
 #define cudaEventDisableTiming musaEventDisableTiming
+#define cudaEventElapsedTime musaEventElapsedTime
 #define cudaEventRecord musaEventRecord
 #define cudaEventSynchronize musaEventSynchronize
 #define cudaEvent_t musaEvent_t