docs-util: Upgrade typedoc to 0.26 (#7853)

Upgrade typedoc to v0.26 + make changes based on the update

Note: This update produces an error when generating model references when the models use the `createPsqlIndexStatementHelper` decorator. As this isn't a breaking error, and as we'll move to DML in the future, it's not necessary to spend time on a fix.

www/utils/packages/utils/package.json

@@ -14,11 +14,11 @@
     "clean": "rimraf dist"
   },
   "peerDependencies": {
-    "typedoc": "0.25.x"
+    "typedoc": "0.26.x"
   },
   "devDependencies": {
     "@types/node": "^16.11.10",
-    "typescript": "5.2"
+    "typescript": "5.5"
   },
   "dependencies": {
     "octokit": "^3.1.2",

www/utils/packages/utils/src/get-type-str.ts

@@ -187,9 +187,9 @@ export function getDeclarationType({
 }: TypeOptions<DeclarationReflection>): string {
   escape = getShouldEscape(wrapBackticks, escape)
 
-  if (model.indexSignature || model.children) {
+  if (model.indexSignatures || model.children) {
     let indexSignature = ""
-    const declarationIndexSignature = model.indexSignature
+    const declarationIndexSignature = model.indexSignatures?.[0]
     if (declarationIndexSignature) {
       const key = declarationIndexSignature.parameters
         ? declarationIndexSignature.parameters.map(