Bump Twirl to `2.0.3` (was `1.6.1`) #585

Job	Run time
Compile Benchmarks	1m 44s
Checks	2m 11s
Compile and test (2.12.18, 8)	3m 39s
Maven tests	3m 18s
Compile and test (2.12.18, 11)	3m 54s
sbt scripted tests (gen-scala-server, 2.12)	7m 48s
Gradle tests	4m 20s
sbt scripted tests (gen-java, 2.12)	3m 22s
Compile and test (2.13.11, 8)	4m 24s
Compile and test (2.13.11, 11)	4m 46s
Compile and test (3.3.1, 8)	5m 47s
Docs	3m 6s
Compile and test (3.3.1, 11)	5m 22s
	53m 41s

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