fix: pinning cdk dependencies

[corymhall]

Something changed after v2.103.1 which causes the action to fail with the below error. Pin it for now.

Error performing diff:  Error: ENOENT: no such file or directory, open '/home/runner/work/_actions/corymhall/cdk-diff-action/v1-beta/db.json.gz'
    at Object.open (node:internal/fs/sync:78:18)
    at Object.openSync (node:fs:565:17)
    at readFileSync (node:fs:445:35)
    at loadAwsServiceSpecSync (/home/runner/work/_actions/corymhall/cdk-diff-action/v1-beta/node_modules/@aws-cdk/aws-service-spec/lib/index.js:44:1)
    at database (/home/runner/work/_actions/corymhall/cdk-diff-action/v1-beta/node_modules/@aws-cdk/cloudformation-diff/lib/diff/util.js:188:1)
    at loadResourceModel (/home/runner/work/_actions/corymhall/cdk-diff-action/v1-beta/node_modules/@aws-cdk/cloudformation-diff/lib/diff/util.js:198:1)
    at diffResource (/home/runner/work/_actions/corymhall/cdk-diff-action/v1-beta/node_modules/@aws-cdk/cloudformation-diff/lib/diff/index.js:39:1)
    at diffKeyedEntities (/home/runner/work/_actions/corymhall/cdk-diff-action/v1-beta/node_modules/@aws-cdk/cloudformation-diff/lib/diff/util.js:138:1)
    at Resources (/home/runner/work/_actions/corymhall/cdk-diff-action/v1-beta/node_modules/@aws-cdk/cloudformation-diff/lib/diff-template.js:30:1)
    at calculateTemplateDiff (/home/runner/work/_actions/corymhall/cdk-diff-action/v1-beta/node_modules/@aws-cdk/cloudformation-diff/lib/diff-template.js:101:1) {
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '/home/runner/work/_actions/corymhall/cdk-diff-action/v1-beta/db.json.gz'
}