Update pdk requirement from ~> 1.0 to ~> 2.5

[dependabot[bot]]

Updates the requirements on pdk to permit the latest version.

Changelog

Sourced from pdk's changelog.

v2.5.0 (2022-04-25)

Full Changelog

Merged pull requests:

• Fixing puppet-syntax errors #1169 (chelnak)

v2.4.0 (2022-02-08)

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Merged pull requests:

• Supplement in_module_root with check for metadata.json #1147 (da-ar)

v2.3.0 (2021-10-21)

Full Changelog

Merged pull requests:

• Account for Psych API changes #1147 (binford2k)

v2.2.0 (2021-08-02)

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Implemented enhancements:

• (GH-1118) Add ability to skip validating files #1114 (jpogran)

Fixed bugs:

• (GH-1113) (GH-917) Fix forge-token handling #1121 (sanfrancrisko)

Merged pull requests:

• (PDK-1729) version to 2.2.0.pre2 #1106 (da-ar)

v2.1.1 (2021-06-22)

Full Changelog

Fixed bugs:

• (PDK-1085) Fail gracefully when no unit tests available #1096 (sanfrancrisko)
• (GH-1090) Verify the changelog top most version matches the metadata version #1088 (carabasdaniel)
• (GH-1083) Bump childprocess to '~> 4.0.0'; Disable @​process.leader #1084 (sanfrancrisko)

... (truncated)

Commits

• 10b8ac9 Merge pull request #1174 from puppetlabs/release_prep_v2.5.0
• b7af285 Merge pull request #1172 from puppetlabs/maint-bump_expected_ruby_versions
• 7654eba (MAINT) Bump expected Ruby versions
• 629ef3c (Maint) Release prep
• 0eec3ab Merge pull request #1169 from puppetlabs/maint-version_bumps
• 35cf940 (GH-1168) Fixing puppet-syntax errors
• a928f87 Merge pull request #1160 from puppetlabs/PDK-1771/master/PDK_2.5.0_pre
• 8f572e9 (PDK-1771) 2.5.0-pre prep
• be5b86e Merge pull request #1159 from hestonhoffman/240-release-notes
• ef1331a (Docs) Edit release note
• Additional commits viewable in compare view

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