Allow all URL schemes in Markdown links by default (#24805)

- Closes #21146
- Closes #16721

## ⚠️ BREAKING ⚠️
This changes the default behavior to now create links for any URL scheme
when the user uses the markdown form for links (`[label](URL)`), this
doesn't affect the rendering of inline links. To opt-out set the
`markdown.CUSTOM_URL_SCHEMES` setting to a list of allowed schemes, all
other schemes (except `http` and `https`) won't be allowed.

# Before

![image](35fa18ce-7dda-4995-b5b3-3f360f38296d)

# After

![image](0922216b-0b35-4b77-9919-21a5c21dd5d0)

---------

Signed-off-by: Yarden Shoham <git@yardenshoham.com>
Co-authored-by: Giteabot <teabot@gitea.io>

go.mod

@@ -76,7 +76,7 @@ require (
 	github.com/mattn/go-sqlite3 v1.14.16
 	github.com/meilisearch/meilisearch-go v0.24.0
 	github.com/mholt/archiver/v3 v3.5.1
-	github.com/microcosm-cc/bluemonday v1.0.23
+	github.com/microcosm-cc/bluemonday v1.0.24
 	github.com/minio/minio-go/v7 v7.0.52
 	github.com/minio/sha256-simd v1.0.0
 	github.com/msteinert/pam v1.1.0
@@ -109,7 +109,7 @@ require (
 	github.com/yuin/goldmark-meta v1.1.0
 	golang.org/x/crypto v0.8.0
 	golang.org/x/image v0.7.0
-	golang.org/x/net v0.9.0
+	golang.org/x/net v0.10.0
 	golang.org/x/oauth2 v0.7.0
 	golang.org/x/sys v0.8.0
 	golang.org/x/text v0.9.0
@@ -288,7 +288,6 @@ require (
 	go.uber.org/zap v1.24.0 // indirect
 	golang.org/x/mod v0.10.0 // indirect
 	golang.org/x/sync v0.2.0 // indirect
-	golang.org/x/term v0.8.0 // indirect
 	golang.org/x/time v0.3.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/genproto v0.0.0-20230306155012-7f2fa6fef1f4 // indirect