chore(deps): update dependency ubuntu to v26

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This PR contains the following updates:

Package	Type	Update	Change
ubuntu	github-runner	major	24.04 → 26.04

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Slowest examples

Top 7 slowest examples (0.01 seconds, 99.99% of total time)

Example	Description	Time in seconds
spec/libraries/helpers_spec.rb:22	Php::Cookbook::Helpers#php_version rhel is expected to eq "7.2"	0.00745
spec/libraries/helpers_spec.rb:50	Php::Cookbook::Helpers#php_version debian ubuntu 18.04 is expected to eq "7.2"	0.00054
spec/libraries/helpers_spec.rb:62	Php::Cookbook::Helpers#php_version debian ubuntu 22.04 is expected to eq "8.1"	0.0005
spec/libraries/helpers_spec.rb:29	Php::Cookbook::Helpers#php_version amazon is expected to eq "8.2"	0.00048
spec/libraries/helpers_spec.rb:38	Php::Cookbook::Helpers#php_version debian debian 10 is expected to eq "7.3"	0.00042
spec/libraries/helpers_spec.rb:44	Php::Cookbook::Helpers#php_version debian debian 11 is expected to eq "7.4"	0.00041
spec/libraries/helpers_spec.rb:56	Php::Cookbook::Helpers#php_version debian ubuntu 20.04 is expected to eq "7.4"	0.00041