Remove unused header (#496)

- Forgejo (since v8, 38ea77ebbe) does not use the value of this header, it was [introduced in v1.20](371520d7ab).
- Older forgejo version than v8 handle it gracefully if this value is not sent.

Reviewed-on: https://code.forgejo.org/forgejo/runner/pulls/496
Reviewed-by: earl-warren <earl-warren@noreply.code.forgejo.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>

internal/pkg/client/header.go

@@ -6,6 +6,4 @@ package client
 const (
 	UUIDHeader  = "x-runner-uuid"
 	TokenHeader = "x-runner-token"
-	// Deprecated: could be removed after Gitea 1.20 released
-	VersionHeader = "x-runner-version"
 )

internal/pkg/client/http.go

@@ -40,10 +40,6 @@ func New(endpoint string, insecure bool, uuid, token, version string, opts ...co
 			if token != "" {
 				req.Header().Set(TokenHeader, token)
 			}
-			// TODO: version will be removed from request header after Gitea 1.20 released.
-			if version != "" {
-				req.Header().Set(VersionHeader, version)
-			}
 			return next(ctx, req)
 		}
 	})))