Update Protobuf3.g4 #4517

Job	Run time
setup	20s
static-check (ubuntu-latest, useless-parens)	33s
static-check (ubuntu-latest, format)	44s
build-pwsh (macos-latest, Cpp)	4m 35s
build-pwsh (macos-latest, CSharp)	2m 24s
build-pwsh (macos-latest, Dart)	1m 52s
build-pwsh (macos-latest, Go)	1m 26s
build-pwsh (macos-latest, Java)	2m 26s
build-pwsh (macos-latest, JavaScript)	2m 7s
build-pwsh (macos-latest, PHP)	3m 55s
build-pwsh (macos-latest, Python3)	2m 26s
build-pwsh (windows-latest, Cpp)	2m 58s
build-pwsh (windows-latest, CSharp)	2m 3s
build-pwsh (windows-latest, Dart)	2m 25s
build-pwsh (windows-latest, Go)	2m 57s
build-pwsh (windows-latest, Java)	2m 13s
build-pwsh (windows-latest, JavaScript)	2m 50s
build-pwsh (windows-latest, PHP)	1m 56s
build-pwsh (windows-latest, Python3)	2m 44s
build-pwsh (ubuntu-latest, Cpp)	2m 28s
build-pwsh (ubuntu-latest, CSharp)	1m 6s
build-pwsh (ubuntu-latest, Dart)	1m 1s
build-pwsh (ubuntu-latest, Go)	1m 8s
build-pwsh (ubuntu-latest, Java)	40s
build-pwsh (ubuntu-latest, JavaScript)	57s
build-pwsh (ubuntu-latest, PHP)	45s
build-pwsh (ubuntu-latest, Python3)	44s
	51m 43s

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