Add nerdfont icons for .bicep & .bicepparam files (#3053)

- **PR Description**
As the title says, I've added the v3 nerd font icons for
[Bicep](https://learn.microsoft.com/en-us/azure/azure-resource-manager/bicep/overview?tabs=bicep).

- **Please check if the PR fulfills these requirements**

* [x] Cheatsheets are up-to-date (run `go generate ./...`)
* [x] Code has been formatted (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#code-formatting))
* [x] Tests have been added/updated (see
[here](https://github.com/jesseduffield/lazygit/blob/master/pkg/integration/README.md)
for the integration test guide)
* [x] Text is internationalised (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#internationalisation))
* [x] Docs (specifically `docs/Config.md`) have been updated if
necessary
* [x] You've read through your own file changes for silly mistakes etc

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pkg/gui/presentation/icons/file_icons.go

@@ -98,6 +98,8 @@ var extIconMap = map[string]IconProperties{
 	".csv":            {Icon: "\uf1c3", Color: 113},     // 
 	".csx":            {Icon: "\U000f031b", Color: 58},  // 󰌛
 	".cxx":            {Icon: "\ue61d", Color: 74},      // 
+	".bicep":          {Icon: "\ue63b", Color: 32},      // 
+	".bicepparam":     {Icon: "\ue63b", Color: 103},     // 
 	".d":              {Icon: "\ue7af", Color: 28},      // 
 	".dart":           {Icon: "\ue798", Color: 25},      // 
 	".db":             {Icon: "\uf1c0", Color: 188},     // 