[8.6] [Security Solution] [Explore] Update tour step font size (#145284) (#146076)

# Backport

This will backport the following commits from `main` to `8.6`:
- [[Security Solution] [Explore] Update tour step font size
(#145284)](https://github.com/elastic/kibana/pull/145284)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Steph
Milovic","email":"stephanie.milovic@elastic.co"},"sourceCommit":{"committedDate":"2022-11-22T21:45:19Z","message":"[Security
Solution] [Explore] Update tour step font size (#145284)\n\nUpdates
`alertsCases` tour step body font size to 14px in alignment
with\r\nhttps://github.com/elastic/kibana/issues/144810","sha":"ecd862184a706b98679a73293101e82e6724b157","branchLabelMapping":{"^v8.7.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","Team:Threat
Hunting","Team: SecuritySolution","Team:Threat
Hunting:Explore","v8.6.0","v8.7.0"],"number":145284,"url":"https://github.com/elastic/kibana/pull/145284","mergeCommit":{"message":"[Security
Solution] [Explore] Update tour step font size (#145284)\n\nUpdates
`alertsCases` tour step body font size to 14px in alignment
with\r\nhttps://github.com/elastic/kibana/issues/144810","sha":"ecd862184a706b98679a73293101e82e6724b157"}},"sourceBranch":"main","suggestedTargetBranches":["8.6"],"targetPullRequestStates":[{"branch":"8.6","label":"v8.6.0","labelRegex":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v8.7.0","labelRegex":"^v8.7.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/145284","number":145284,"mergeCommit":{"message":"[Security
Solution] [Explore] Update tour step font size (#145284)\n\nUpdates
`alertsCases` tour step body font size to 14px in alignment
with\r\nhttps://github.com/elastic/kibana/issues/144810","sha":"ecd862184a706b98679a73293101e82e6724b157"}}]}]
BACKPORT-->

Co-authored-by: Steph Milovic <stephanie.milovic@elastic.co>

x-pack/plugins/security_solution/public/common/components/guided_onboarding_tour/tour_step.tsx

@@ -99,7 +99,7 @@ export const SecurityTourStep = ({ children, onClick, step, tourId }: SecurityTo
     ...rest,
     content: (
       <>
-        <EuiText size="xs">
+        <EuiText size="s">
           <p>{content}</p>
         </EuiText>
         {imageConfig && (