Update JS dependencies and misc tweaks (#25540)

- Update all JS dependencies
- Enable `declaration-property-unit-disallowed-list` to forbid `em` on
`line-height`
- Rename dependency update targets to `update-js` and `update-py` and
document them
- Remove margin on Asciicast viewer
- Tested Swagger, Katex, Asciicast

<img width="1243" alt="Screenshot 2023-06-27 at 19 51 05"
src="https://github.com/go-gitea/gitea/assets/115237/2d2722a0-2aa7-4f4c-b8bd-17e1f3637b78">

web_src/css/repo.css

@@ -478,7 +478,7 @@
 }
 
 .repository.file.list .non-diff-file-content .asciicast {
-  padding: 5px !important;
+  padding: 0 !important;
 }
 
 .non-diff-file-content .attached.segment,
@@ -1903,7 +1903,7 @@
 
 .repository.settings.collaboration .collaborator.list > .item {
   margin: 0;
-  line-height: 2em;
+  line-height: 2;
 }
 
 .repository.settings.collaboration #repo-collab-form #search-user-box .results {
@@ -2601,7 +2601,7 @@
 .labels-list .label {
   margin: 2px 0;
   display: inline-flex !important;
-  line-height: 1.3em; /* there is a `font-size: 1.25em` for inside emoji, so here the line-height needs to be larger slightly */
+  line-height: 1.3; /* there is a `font-size: 1.25em` for inside emoji, so here the line-height needs to be larger slightly */
 }
 
 /* Scoped labels with different colors on left and right */