chore: fix dafny version release scripts (#1369)

Author: josecorella

codebuild/release/release-prod.yml

@@ -19,7 +19,7 @@ phases:
     commands:
       - cd ..
       # Get Dafny
-      - curl https://github.com/dafny-lang/dafny/releases/download/v4.2.0/dafny-4.2.0-x64-ubuntu-20.04.zip  -L -o dafny.zip
+      - curl https://github.com/dafny-lang/dafny/releases/download/v4.8.0/dafny-4.8.0-x64-ubuntu-20.04.zip  -L -o dafny.zip
       - unzip -qq dafny.zip && rm dafny.zip
       - export PATH="$PWD/dafny:$PATH"
       # Get Gradle 7.6

codebuild/release/validate-release.yml

@@ -14,7 +14,7 @@ phases:
     commands:
       - cd ..
       # Get Dafny
-      - curl https://github.com/dafny-lang/dafny/releases/download/v4.2.0/dafny-4.2.0-x64-ubuntu-20.04.zip  -L -o dafny.zip
+      - curl https://github.com/dafny-lang/dafny/releases/download/v4.8.0/dafny-4.8.0-x64-ubuntu-20.04.zip  -L -o dafny.zip
       - unzip -qq dafny.zip && rm dafny.zip
       - export PATH="$PWD/dafny:$PATH"
       # Get Gradle 7.6

codebuild/staging/release-staging.yml

@@ -21,7 +21,7 @@ phases:
     commands:
       - cd ..
       # Get Dafny
-      - curl https://github.com/dafny-lang/dafny/releases/download/v4.2.0/dafny-4.2.0-x64-ubuntu-20.04.zip  -L -o dafny.zip
+      - curl https://github.com/dafny-lang/dafny/releases/download/v4.8.0/dafny-4.8.0-x64-ubuntu-20.04.zip  -L -o dafny.zip
       - unzip -qq dafny.zip && rm dafny.zip
       - export PATH="$PWD/dafny:$PATH"
       # Get Gradle 7.6

codebuild/staging/validate-staging.yml

@@ -18,7 +18,7 @@ phases:
     commands:
       - cd ..
       # Get Dafny
-      - curl https://github.com/dafny-lang/dafny/releases/download/v4.2.0/dafny-4.2.0-x64-ubuntu-20.04.zip  -L -o dafny.zip
+      - curl https://github.com/dafny-lang/dafny/releases/download/v4.8.0/dafny-4.8.0-x64-ubuntu-20.04.zip  -L -o dafny.zip
       - unzip -qq dafny.zip && rm dafny.zip
       - export PATH="$PWD/dafny:$PATH"
       # Get Gradle 7.6