Use swift-sdk-generator from update-checkout instead of submodule

Author: kateinoigakukun

.github/dependabot.yml

@@ -9,7 +9,3 @@ updates:
     directory: '/'
     schedule:
       interval: 'weekly'
-  - package-ecosystem: 'gitsubmodule'
-    directory: '/'
-    schedule:
-      interval: 'daily'

.github/scripts/build-matrix.rb

@@ -27,7 +27,6 @@ def affected_schemes(changes, schemes)
     prefixes = [
       "schemes/#{scheme}/",
       "tools/build/",
-      "tools/swift-sdk-generator",
       "tools/git-swift-workspace",
     ]
     changes.any? do |change|

.github/workflows/build-toolchain.yml

@@ -35,7 +35,6 @@ jobs:
             changed:
               - "schemes/**"
               - "tools/build/**"
-              - "tools/swift-sdk-generator"
               - "tools/git-swift-workspace"
 
       - name: Generate entries
@@ -129,7 +128,7 @@ jobs:
         run: |
           rm -rf ${{ github.workspace }}/build \
             ${{ github.workspace }}/swift \
-            ${{ github.workspace }}/swiftwasm-build/tools/swift-sdk-generator/Bundles \
+            ${{ github.workspace }}/swift-sdk-generator/Bundles \
             ${{ github.workspace }}/build-cache \
             ${{ github.workspace }}/build-sdk
 
@@ -274,7 +273,7 @@ jobs:
           docker exec swiftwasm-ci-buildbot /bin/bash -lc \
             "./llvm-project/llvm/utils/lit/lit.py \
               --param swift-sdk=wasm32-unknown-wasi \
-              --param swift-sdks-path=./swiftwasm-build/tools/swift-sdk-generator/Bundles \
+              --param swift-sdks-path=./swift-sdk-generator/Bundles \
               --param scheme=${{ matrix.scheme }} ./swiftwasm-build/test -vv"
 
       - name: Cleanup docker volume

.gitmodules

@@ -118,7 +118,7 @@ class PackageSwiftSDKAction(Action):
         :param wasi_sysroot_path: The path to the WASI sysroot.
         """
         sdk_generator_pkg_path = os.path.join(
-            os.path.dirname(__file__), "..", "swift-sdk-generator")
+            os.path.dirname(__file__), "..", "..", "..", "swift-sdk-generator")
         sdk_generator_args = [
             "swift",
             "run", "--package-path", sdk_generator_pkg_path,