Update pin and add pin-slash (#24669)

Continue #23531
Thanks for the update in https://github.com/primer/octicons/issues/940,
@CameronFoxly

![image](https://github.com/go-gitea/gitea/assets/18380374/bc512b20-b656-4bd7-8e70-3a2b7eca9d65)

![image](https://github.com/go-gitea/gitea/assets/18380374/a3863267-6a7a-48d5-8157-9f361fec3fed)

package-lock.json

@@ -16,7 +16,7 @@
         "@github/relative-time-element": "4.3.0",
         "@github/text-expander-element": "2.3.0",
         "@mcaptcha/vanilla-glue": "0.1.0-alpha-3",
-        "@primer/octicons": "18.3.0",
+        "@primer/octicons": "19.1.0",
         "@vue/compiler-sfc": "3.2.47",
         "@webcomponents/custom-elements": "1.6.0",
         "add-asset-webpack-plugin": "2.0.1",
@@ -1174,9 +1174,9 @@
       }
     },
     "node_modules/@primer/octicons": {
-      "version": "18.3.0",
-      "resolved": "https://registry.npmjs.org/@primer/octicons/-/octicons-18.3.0.tgz",
-      "integrity": "sha512-vyUej5rKjXfqHAmYSo2k3pA9IsL5KJaYOBVXvc188FwBfUweA+WVP3qwWyZTSQnp9LK6yOajGyr0SCMIa9ombw==",
+      "version": "19.1.0",
+      "resolved": "https://registry.npmjs.org/@primer/octicons/-/octicons-19.1.0.tgz",
+      "integrity": "sha512-5o90F89gNPnAk1qfzl3hb/TcsUjk5g0WFI+fBRHLkBKzB3uc9EvxTpgzjXhhjyriOkrBOjFo58D0sjtwttaQww==",
       "dependencies": {
         "object-assign": "^4.1.1"
       }