Update pin and add pin-slash (#24669)

Continue #23531
Thanks for the update in primer/octicons#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.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",

templates/projects/view.tmpl

@@ -109,7 +109,7 @@
 									data-modal-default-project-board-header="{{$.locale.Tr "repo.projects.column.unset_default"}}"
 									data-modal-default-project-board-content="{{$.locale.Tr "repo.projects.column.unset_default_desc"}}"
 									data-url="{{$.Link}}/{{.ID}}/unsetdefault">
-										{{svg "octicon-pin"}}
+										{{svg "octicon-pin-slash"}}
 										{{$.locale.Tr "repo.projects.column.unset_default"}}
 									</a>
 								{{end}}

templates/repo/projects/view.tmpl

@@ -115,7 +115,7 @@
 									data-modal-default-project-board-content="{{$.locale.Tr "repo.projects.column.unset_default_desc"}}"
 									data-type="unset_default"
 									data-url="{{$.Link}}/{{.ID}}/unsetdefault">
-										{{svg "octicon-pin"}}
+										{{svg "octicon-pin-slash"}}
 										{{$.locale.Tr "repo.projects.column.unset_default"}}
 									</a>
 								{{end}}