Update dependabot policy to group updates

[reubeno]

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Test Results

372 tests   354 ✅  2m 36s ⏱️
 63 suites   18 💤
  8 files      0 ❌

Results for commit 378f5e1.

[github-actions]

Performance Benchmark Report

Benchmark name	Baseline (ns)	Test/PR (ns)	Delta (ns)	Delta %
expand_one_string	3448 ns	3450 ns	+2 ns	🟠 +0.06%
instantiate_shell	65344 ns	65696 ns	+352 ns	🟠 +0.54%
instantiate_shell_with_init_scripts	47066409 ns	47543388 ns	+476979 ns	🟠 +1.01%
parse_bash_completion	6592493 ns	6637669 ns	+45176 ns	🟠 +0.69%
parse_sample_script	10793 ns	10879 ns	+86 ns	🟠 +0.80%
run_echo_builtin_command	104638 ns	106372 ns	+1734 ns	🟠 +1.66%
run_one_builtin_command	121681 ns	122239 ns	+558 ns	🟠 +0.46%
run_one_external_command	1879812 ns	1815648 ns	-64164 ns	🟢 -3.41%
run_one_external_command_directly	1032467 ns	1029724 ns	-2743 ns	🟢 -0.27%

Code Coverage Report

Package	Base Coverage	New Coverage	Difference
cli.src	🟠 73.33%	🟠 73.33%	⚪ 0%
interactive-shell.src	🟢 76.02%	🟢 76.02%	⚪ 0%
parser.src	🟢 85.88%	🟢 85.88%	⚪ 0%
shell.src	🟢 80.42%	🟢 80.42%	⚪ 0%
shell.src.builtins	🟠 73.53%	🟠 73.53%	⚪ 0%
Overall Coverage	🟢 80.05%	🟢 80.05%	⚪ 0%

Minimum allowed coverage is 0%, this run produced 80.05%