fix: update default copyright year #1970

Job	Run time
Generated: pytest Simple Package	11s
Template: 3.9 - ubuntu-latest	19s
Generated: pytest Simple CLI	14s
Template: 3.9 - macOS-latest	30s
Generated: pytest Django Package	16s
Template: 3.10 - ubuntu-latest	17s
Generated: pre-commit Simple Package	29s
Template: 3.10 - macOS-latest	33s
Generated: pre-commit Simple CLI	28s
Template: 3.11 - ubuntu-latest	15s
Generated: pre-commit Django Package	29s
Template: 3.11 - macOS-latest	15s
Generated: docs Simple Package	11s
Template: 3.12 - ubuntu-latest	15s
Generated: docs Simple CLI	10s
Template: 3.12 - macOS-latest	25s
Generated: docs Django Package	17s
	5m 34s

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