refactor(manager): more strict null checks (#15168)

lib/modules/manager/composer/artifacts.ts

lib/modules/manager/composer/extract.ts

lib/modules/manager/composer/range.ts

lib/modules/manager/composer/types.ts

lib/modules/manager/composer/update-locked.ts

lib/modules/manager/composer/utils.ts

lib/modules/manager/git-submodules/artifacts.ts

lib/modules/manager/git-submodules/update.ts

lib/modules/manager/gomod/artifacts.ts

lib/modules/manager/gomod/extract.ts

lib/modules/manager/gomod/update.ts

lib/modules/manager/gradle-wrapper/artifacts.ts

lib/modules/manager/gradle-wrapper/utils.ts

lib/modules/manager/gradle/__testutil__/gradle.ts

lib/modules/manager/gradle/extract.ts

lib/modules/manager/gradle/extract/catalog.ts

lib/modules/manager/gradle/parser.ts

lib/modules/manager/gradle/types.ts

lib/modules/manager/gradle/update.ts

lib/modules/manager/gradle/utils.ts