update the "checkout" action to v6

Author: stephengold

.github/workflows/push.yml

@@ -13,8 +13,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 11
-      - uses: actions/checkout@v5
-      - run: g++ --version
+      - uses: actions/checkout@v6
       - uses: gradle/actions/setup-gradle@v5
       - name: gradlew -Pbt=Debug -Pflavor=Sp -Ptarget=Linux64 -Ptool=gcc -x checkstyleMain -x checkstyleTest build install
         if: "!startsWith(github.ref, 'refs/tags/')"
@@ -30,7 +29,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 21
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gradle/actions/setup-gradle@v5
       - name: gradlew -Ptarget=Linux64 runSmokeTestAll -x checkstyleMain -x checkstyleTest build install
         if: "!startsWith(github.ref, 'refs/tags/')"
@@ -60,7 +59,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 21
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gradle/actions/setup-gradle@v5
       - name: gradlew -Ptarget=Linux64_fma runSmokeTestAll -x checkstyleMain -x checkstyleTest build install
         if: "!startsWith(github.ref, 'refs/tags/')"
@@ -90,7 +89,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 21
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gradle/actions/setup-gradle@v5
       - name: gradlew -Pbt=Debug -Pflavor=Sp -Ptarget=MacOSX64 -x checkstyleMain -x checkstyleTest run runSmokeTestAll build install
         if: "!startsWith(github.ref, 'refs/tags/')"
@@ -120,7 +119,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 21
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gradle/actions/setup-gradle@v5
       - name: gradlew -Pbt=Debug -Pflavor=Dp -Ptarget=MacOSX_ARM64 -x checkstyleMain -x checkstyleTest runSmokeTestAll build install
         if: "!startsWith(github.ref, 'refs/tags/')"
@@ -150,7 +149,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 21
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gradle/actions/setup-gradle@v5
       - name: gradlew -Ptarget=Windows64 runSmokeTestAll -x checkstyleMain -x checkstyleTest build install
         if: "!startsWith(github.ref, 'refs/tags/')"
@@ -183,7 +182,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 21
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gradle/actions/setup-gradle@v5
       - name: gradlew -Ptarget=Windows64_avx2 runSmokeTestAll -x checkstyleMain -x checkstyleTest build install
         if: "!startsWith(github.ref, 'refs/tags/')"
@@ -216,7 +215,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 21
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gradle/actions/setup-gradle@v5
       - name: gradlew classes unpackJoltSource unpackTestFramework unpackVhacdSource
         run: |
@@ -250,7 +249,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 21
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: sudo apt-get update
       - run: sudo apt install g++-9-arm-linux-gnueabihf
       - run: arm-linux-gnueabihf-g++-9 --version
@@ -283,7 +282,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 21
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: sudo apt-get update
       - run: sudo apt install g++-10-aarch64-linux-gnu
       - run: aarch64-linux-gnu-g++-10 --version
@@ -316,7 +315,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 21
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: sudo apt-get update
       - run: sudo apt install g++-13-loongarch64-linux-gnu
       - run: loongarch64-linux-gnu-g++-13 --version
@@ -335,7 +334,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 24
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gradle/actions/setup-gradle@v5
       - uses: gradle/actions/wrapper-validation@v4
       - name: gradlew -Pbt=Release -Pflavor=Sp -Ptarget=Linux64 build install