chore(lint): Remove unnecessary depguard rules (#10256)

* github.com/unknwon/com is no longer importe
* ioutil is no longer used (and covered by Go's own vetting rules)

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/10256
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: nachtjasmin <nachtjasmin@posteo.de>
Co-committed-by: nachtjasmin <nachtjasmin@posteo.de>

.golangci.yml

@@ -30,10 +30,6 @@ linters:
           deny:
             - pkg: encoding/json
               desc: use gitea's modules/json instead of encoding/json
-            - pkg: github.com/unknwon/com
-              desc: use gitea's util and replacements
-            - pkg: io/ioutil
-              desc: use os or io instead
             - pkg: golang.org/x/exp
               desc: it's experimental and unreliable
             - pkg: forgejo.org/modules/git/internal