Update changes from ver/1.21.4 branch

Author: Dreeam-qwq

.github/workflows/build-1215.yml

@@ -13,12 +13,12 @@ jobs:
       GRADLE_MEMORY: "-Xmx4g -XX:MaxMetaspaceSize=2g"
     steps:
       - name: Checkout repository
-        uses: actions/checkout@main
+        uses: actions/checkout@v4.2.2
         with:
           fetch-depth: 0
 
       - name: Setup Gradle Cache
-        uses: useblacksmith/cache@v5
+        uses: useblacksmith/cache@v5.0.2
         with:
           path: |
             ~/.gradle/caches/modules-2
@@ -40,7 +40,7 @@ jobs:
           find ~/.gradle/caches -name "*.lock" -type f -delete || echo "No lock files found"
 
       - name: Setup java
-        uses: useblacksmith/setup-java@v5
+        uses: useblacksmith/setup-java@v5.0.1
         with:
           distribution: 'temurin'
           java-version: '21'
@@ -91,13 +91,13 @@ jobs:
           BUILD_NUMBER: ${{ env.BUILD_NUMBER }}
 
       - name: Upload Leaf
-        uses: actions/upload-artifact@main
+        uses: actions/upload-artifact@v4.6.2
         with:
           name: Leaf 1.21.5
           path: ./leaf-1.21.5-${{ env.BUILD_NUMBER }}.jar
 
       - name: Release Leaf
-        uses: softprops/action-gh-release@v2.2.2 # Temp fix
+        uses: softprops/action-gh-release@v2.3.2
         with:
           name: "Leaf 1.21.5"
           tag_name: "ver-1.21.5"
@@ -116,7 +116,7 @@ jobs:
           echo "sha256=$HASH" >> $GITHUB_OUTPUT
 
       - name: Upload JAR to download API
-        uses: appleboy/scp-action@master
+        uses: appleboy/scp-action@v1.0.0
         with:
           host: ${{ secrets.API_HOST }}
           username: ${{ secrets.API_USER }}
@@ -125,7 +125,7 @@ jobs:
           target: "~/api/uploads/"
 
       - name: Insert build to download API
-        uses: appleboy/ssh-action@master
+        uses: appleboy/ssh-action@v1.2.2
         with:
           host: ${{ secrets.API_HOST }}
           username: ${{ secrets.API_USER }}

leaf-api/paper-patches/features/0018-Configurable-LibraryLoader-maven-repos.patch

@@ -66,7 +66,7 @@ index ebb52c2c8d5fe8ca25513aadae8168180a3d426e..006a86da6afa1b7b80df5df073ebd236
 +    private static RemoteRepository getCentralMirrorRepo() {
 +        String mirrorAddr = System.getProperty("Leaf.library-download-repo");
 +        if (mirrorAddr != null) {
-+            new RemoteRepository.Builder("central", "default", mirrorAddr).build();
++            return new RemoteRepository.Builder("central", "default", mirrorAddr).build();
 +        }
 +        return null;
 +    }

public/readme/README_CN.md

@@ -124,15 +124,15 @@ Leaf 根据其上游项目及其他材料，采用多种开源许可证授权，
 
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