docs: add tannisroot as a contributor for code (#20724)

Adds @tannisroot as a contributor for code.

This was requested by stavros-k [in this
comment](https://github.com/truecharts/charts/pull/20623#issuecomment-2053797846)

[skip ci]

---------

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

.all-contributorsrc

@@ -2308,6 +2308,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "tannisroot",
+      "name": "Aleksandr Oleinikov",
+      "avatar_url": "https://avatars.githubusercontent.com/u/10602045?v=4",
+      "profile": "https://github.com/tannisroot",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,