Update ruby actions

.github/workflows/build_rpi3.yml

@@ -26,9 +26,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Set up Ruby 2.x
-        uses: actions/setup-ruby@v1
-        with:
-          ruby-version: "2.7"
+        uses: ruby/setup-ruby@v1
       - name: Set up Rust nightly
         run: |
           cargo install cargo-binutils

.github/workflows/build_rpi4.yml

@@ -26,9 +26,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Set up Ruby 2.x
-        uses: actions/setup-ruby@v1
-        with:
-          ruby-version: "2.7"
+        uses: ruby/setup-ruby@v1
       - name: Set up Rust nightly
         run: |
           cargo install cargo-binutils

.github/workflows/sanity.yml

@@ -20,9 +20,7 @@ jobs:
         with:
           node-version: "12"
       - name: Set up Ruby 2.x
-        uses: actions/setup-ruby@v1
-        with:
-          ruby-version: "2.7"
+        uses: ruby/setup-ruby@v1
       - name: Set up Rust nightly
         run: |
           rustup component add clippy

.github/workflows/test_integration.yml

@@ -26,9 +26,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Set up Ruby 2.x
-        uses: actions/setup-ruby@v1
-        with:
-          ruby-version: "2.7"
+        uses: ruby/setup-ruby@v1
       - name: Set up Rust nightly
         run: |
           cargo install cargo-binutils

.github/workflows/test_unit.yml

@@ -26,9 +26,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Set up Ruby 2.x
-        uses: actions/setup-ruby@v1
-        with:
-          ruby-version: "2.7"
+        uses: ruby/setup-ruby@v1
       - name: Set up Rust nightly
         run: |
           cargo install cargo-binutils

.github/workflows/test_xtra.yml

@@ -26,9 +26,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Set up Ruby 2.x
-        uses: actions/setup-ruby@v1
-        with:
-          ruby-version: "2.7"
+        uses: ruby/setup-ruby@v1
       - name: Set up Rust nightly
         run: |
           cargo install cargo-binutils

.ruby-version

@@ -0,0 +1 @@
+2.7