all: statically link to LLVM 17 instead of LLVM 16

We can now finally do it, now that Espressif has updated their fork.

.github/workflows/windows.yml

@@ -41,7 +41,7 @@ jobs:
         uses: actions/cache/restore@v3
         id: cache-llvm-source
         with:
-          key: llvm-source-16-windows-v1
+          key: llvm-source-17-windows-v1
           path: |
             llvm-project/clang/lib/Headers
             llvm-project/clang/include
@@ -66,7 +66,7 @@ jobs:
         uses: actions/cache/restore@v3
         id: cache-llvm-build
         with:
-          key: llvm-build-16-windows-v2
+          key: llvm-build-17-windows-v1
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'