minimum TypeScript version is 4.6.

.github/workflows/test.yml

@@ -180,9 +180,6 @@ jobs:
       fail-fast: false
       matrix:
         typescript-version: [
-            ^4.3, # 26.5.2021 https://devblogs.microsoft.com/typescript/announcing-typescript-4-3/
-            4.4.3, # 26.8.2021 https://devblogs.microsoft.com/typescript/announcing-typescript-4-4/
-            ^4.5, # 17.11.2021 https://devblogs.microsoft.com/typescript/announcing-typescript-4-5/
             ^4.6, # 28.2.2022 https://devblogs.microsoft.com/typescript/announcing-typescript-4-6/
             ^4.7, # 24.5.2022 https://devblogs.microsoft.com/typescript/announcing-typescript-4-7/
             ^4.8, # 25.8.2022 https://devblogs.microsoft.com/typescript/announcing-typescript-4-8/
@@ -209,7 +206,7 @@ jobs:
         run: npm run build
 
       - name: Install older TypeScript
-        run: npm i -D typescript@${{ matrix.typescript-version }} tsd@${{ fromJson('{ "^4.3":"0.17.0", "4.4.3":"0.18.0", "^4.5":"0.19.1", "^4.6":"0.20.0", "^4.7":"0.22.0", "^4.8":"0.24.1", "^4.9":"0.27.0", "^5.0":"0.28.1", "^5.2":"0.29.0", "^5.3":"0.30.7", "^5.4":"0.31.2" }')[matrix.typescript-version] }}
+        run: npm i -D typescript@${{ matrix.typescript-version }} tsd@${{ fromJson('{ "^4.6":"0.20.0", "^4.7":"0.22.0", "^4.8":"0.24.1", "^4.9":"0.27.0", "^5.0":"0.28.1", "^5.2":"0.29.0", "^5.3":"0.30.7", "^5.4":"0.31.2" }')[matrix.typescript-version] }}
 
       - name: Run tests with older TypeScript
         run: npm run test:typings && npm run test:node:build