software/theia: update plugins

Some old version of plugins have been removed from openvsx when they
changed licence. Uploaders who did not sign the licence had their extensions
removed. This was the case for some builtin vscode extensions uploaded by
openvsx script.

software/theia/generate_download_plugins_cfg.py

@@ -24,7 +24,9 @@ for plugin_and_version in '''\
     vscode/handlebars/latest
     vscode/hlsl/latest
     vscode/html/latest
-    vscode/html-language-features/latest
+# latest fails to activate:
+# Activating extension 'HTML Language Features (built-in)' failed: The language client requires VS Code version ^1.52.0 but received version 1.50.0
+    vscode/html-language-features/1.52.1
     vscode/ini/latest
     vscode/jake/latest
     vscode/java/latest
@@ -39,7 +41,7 @@ for plugin_and_version in '''\
     vscode/make/latest
     vscode/markdown/latest
 # https://github.com/eclipse-theia/theia/issues/7780
-    vscode/markdown-language-features/1.39.1
+    vscode/markdown-language-features/1.39.2
     vscode/merge-conflict/latest
     vscode/npm/latest
     ms-vscode/node-debug/latest
@@ -82,7 +84,7 @@ for plugin_and_version in '''\
     vscjava/vscode-java-test/0.26.0
     ms-python/python/2020.9.112786
     perrinjerome/vscode-zc-buildout/latest
-    jebbs/plantuml/2.13.12
+    jebbs/plantuml/2.14.0
     rafaelmaiolla/diff/latest
     perrinjerome/git-commit-syntax/latest
     perrinjerome/git-rebase-syntax/latest