mojo/v23proxy: Use _ instead of - in pubspec.yaml

As title. The reason is that pubspec.yaml doesn't accept - in later
versions of dart and pub.

Closes https://github.com/vanadium/issues/issues/1205

Change-Id: If645d4b26e052c7410906bed278a46c8b6c2afd7
diff --git a/dart-examples/echo/pubspec.yaml b/dart-examples/echo/pubspec.yaml
index 58b3a29..acd6dca 100644
--- a/dart-examples/echo/pubspec.yaml
+++ b/dart-examples/echo/pubspec.yaml
@@ -1,7 +1,7 @@
 author: Vanadium Authors
 description: Echo is an example Mojo Dart application that uses the v23proxy.
 homepage: https://github.com/vanadium/mojo.v23proxy
-name: v23proxy-echo
+name: v23proxy_echo
 version: 0.0.1
 dependencies:
   mojo: '>=0.3.0 <0.4.0'
diff --git a/dart-examples/echo_server/pubspec.yaml b/dart-examples/echo_server/pubspec.yaml
index 192e75d..419d372 100644
--- a/dart-examples/echo_server/pubspec.yaml
+++ b/dart-examples/echo_server/pubspec.yaml
@@ -1,7 +1,7 @@
 author: Vanadium Authors
 description: Echo Server is an example Mojo Dart application that uses the v23proxy.
 homepage: https://github.com/vanadium/mojo.v23proxy
-name: v23proxy-echo-server
+name: v23proxy_echo_server
 version: 0.0.1
 dependencies:
   mojo: '>=0.3.0 <0.4.0'
diff --git a/dart-examples/fortune/pubspec.yaml b/dart-examples/fortune/pubspec.yaml
index c73f56d..f4ab8d7 100644
--- a/dart-examples/fortune/pubspec.yaml
+++ b/dart-examples/fortune/pubspec.yaml
@@ -1,7 +1,7 @@
 author: Vanadium Authors
 description: Fortune is an example Mojo Dart application that uses the v23proxy.
 homepage: https://github.com/vanadium/mojo.v23proxy
-name: v23proxy-fortune
+name: v23proxy_fortune
 version: 0.0.1
 dependencies:
   mojo: '>=0.3.0 <0.4.0'
diff --git a/dart-examples/fortune_server/pubspec.yaml b/dart-examples/fortune_server/pubspec.yaml
index 3eb56ca..d0d2fcb 100644
--- a/dart-examples/fortune_server/pubspec.yaml
+++ b/dart-examples/fortune_server/pubspec.yaml
@@ -1,7 +1,7 @@
 author: Vanadium Authors
 description: Fortune Server is an example Mojo Dart application that uses the v23proxy.
 homepage: https://github.com/vanadium/mojo.v23proxy
-name: v23proxy-fortune-server
+name: v23proxy_fortune_server
 version: 0.0.1
 dependencies:
   mojo: '>=0.3.0 <0.4.0'
diff --git a/dart-tests/end_to_end_test/pubspec-dev.yaml b/dart-tests/end_to_end_test/pubspec-dev.yaml
index 261b4e8..b09d69a 100644
--- a/dart-tests/end_to_end_test/pubspec-dev.yaml
+++ b/dart-tests/end_to_end_test/pubspec-dev.yaml
@@ -1,7 +1,7 @@
 author: Vanadium Authors
 description: End To End Test
 homepage: https://github.com/vanadium/mojo.v23proxy
-name: v23proxy-end-to-end-test
+name: v23proxy_end_to_end_test
 version: 0.0.1
 dependencies:
   mojo: '>=0.3.0 <0.4.0'
diff --git a/dart-tests/end_to_end_test/pubspec.yaml b/dart-tests/end_to_end_test/pubspec.yaml
index 2a7dfd2..7904eb0 100644
--- a/dart-tests/end_to_end_test/pubspec.yaml
+++ b/dart-tests/end_to_end_test/pubspec.yaml
@@ -1,7 +1,7 @@
 author: Vanadium Authors
 description: End To End Test
 homepage: https://github.com/vanadium/mojo.v23proxy
-name: v23proxy-end-to-end-test
+name: v23proxy_end_to_end_test
 version: 0.0.1
 dependencies:
   mojo_sdk: 0.2.15