flutter pub upgrade (#178)

web/_tool/pubspec.lock

@@ -21,7 +21,7 @@ packages:
       name: markdown
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.3"
   path:
     dependency: "direct main"
     description:

web/dad_jokes/pubspec.lock

@@ -61,7 +61,7 @@ packages:
       name: pedantic
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0+1"
+    version: "1.9.0"
   sky_engine:
     dependency: transitive
     description: flutter

web/filipino_cuisine/pubspec.lock

@@ -75,7 +75,7 @@ packages:
       name: pedantic
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0+1"
+    version: "1.9.0"
   sky_engine:
     dependency: transitive
     description: flutter

web/github_dataviz/pubspec.lock

@@ -68,7 +68,7 @@ packages:
       name: pedantic
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0+1"
+    version: "1.9.0"
   sky_engine:
     dependency: transitive
     description: flutter

web/slide_puzzle/pubspec.lock

@@ -1,13 +1,20 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  _fe_analyzer_shared:
+    dependency: transitive
+    description:
+      name: _fe_analyzer_shared
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.1"
   analyzer:
     dependency: transitive
     description:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.36.4"
+    version: "0.39.2+1"
   archive:
     dependency: transitive
     description:
@@ -88,13 +95,6 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  front_end:
-    dependency: transitive
-    description:
-      name: front_end
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.1.19"
   glob:
     dependency: transitive
     description:
@@ -151,13 +151,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.6.1+1"
-  kernel:
-    dependency: transitive
-    description:
-      name: kernel
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.3.19"
   logging:
     dependency: transitive
     description: