Update librarian installation and protoc version

Author: sofisl

.github/workflows/librarian_library_generation.yaml

@@ -43,14 +43,14 @@ jobs:
     - name: Install Librarian
       if: env.SHOULD_RUN == 'true'
       run: |
-        LIBRARIAN_VERSION=$(grep "^version:" librarian.yaml | cut -d':' -f2 | xargs)
-        echo "Installing librarian version $LIBRARIAN_VERSION"
-        go install github.com/googleapis/librarian/cmd/librarian@$LIBRARIAN_VERSION
+        V=$(go run github.com/googleapis/librarian/cmd/librarian@latest config get version)
+        echo "Installing librarian version $V"
+        go install github.com/googleapis/librarian/cmd/librarian@$V
     - name: Install protoc
       if: env.SHOULD_RUN == 'true'
       run: |
         set -e
-        VERSION="31.0"
+        VERSION="33.2"
         curl -fsSL --retry 5 --retry-delay 15 -o /tmp/protoc.zip "https://github.com/protocolbuffers/protobuf/releases/download/v$VERSION/protoc-$VERSION-linux-x86_64.zip"
         cd /usr/local
         sudo unzip -o /tmp/protoc.zip