No longer gitignore pubspec.lock (#14768)

packages/flutter_tools/templates/create/.gitignore.tmpl

diff --git a/packages/flutter_tools/templates/create/.gitignore.tmpl b/packages/flutter_tools/templates/create/.gitignore.tmpl
index 3b9b8ba..a03e2bf 100644
--- a/packages/flutter_tools/templates/create/.gitignore.tmpl
+++ b/packages/flutter_tools/templates/create/.gitignore.tmpl
@@ -7,5 +7,4 @@
 build/
 ios/.generated/
 packages
-pubspec.lock
 .flutter-plugins

packages/flutter_tools/templates/package/.gitignore.tmpl

diff --git a/packages/flutter_tools/templates/package/.gitignore.tmpl b/packages/flutter_tools/templates/package/.gitignore.tmpl
index 75e9658..9c14e47 100644
--- a/packages/flutter_tools/templates/package/.gitignore.tmpl
+++ b/packages/flutter_tools/templates/package/.gitignore.tmpl
@@ -4,4 +4,3 @@
 .packages
 .pub/
 packages
-pubspec.lock