chore: update GCC version in CI workflow to 15.2.Rel1

[gabrielfrasantos]

No description provided.

[gabrielfrasantos]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	5		0	0	0.05s
✅ CPP	clang-format	15	6	0	0	1.53s
✅ CPP	cppcheck	15		0	0	0.83s
✅ DOCKERFILE	hadolint	1		0	0	0.03s
✅ JSON	jsonlint	7		0	0	0.35s
✅ JSON	prettier	7	2	0	0	1.96s
⚠️ MARKDOWN	markdownlint	12	1	19	0	2.63s
✅ MARKDOWN	markdown-table-formatter	12	1	0	0	1.68s
✅ REPOSITORY	checkov	yes		no	no	48.12s
✅ REPOSITORY	git_diff	yes		no	no	1.3s
✅ REPOSITORY	grype	yes		no	no	78.35s
✅ REPOSITORY	ls-lint	yes		no	no	0.01s
✅ REPOSITORY	osv-scanner	yes		no	no	0.77s
✅ REPOSITORY	secretlint	yes		no	no	90.47s
✅ REPOSITORY	syft	yes		no	no	1.77s
✅ REPOSITORY	trivy	yes		no	no	24.11s
✅ REPOSITORY	trivy-sbom	yes		no	no	1.73s
✅ REPOSITORY	trufflehog	yes		no	no	16.1s
⚠️ SPELL	lychee	38		4	0	19.48s
✅ YAML	prettier	8	1	0	0	1.98s
✅ YAML	v8r	8		0	0	9.61s
✅ YAML	yamllint	8		0	0	0.71s

Detailed Issues

⚠️ SPELL / lychee - 4 errors

📝 Summary
---------------------
🔍 Total..........261
🔗 Unique.........243
✅ Successful.....252
⏳ Timeouts.........0
🔀 Redirected.....111
👻 Excluded.........5
❓ Unknown..........0
🚫 Errors...........4
⛔ Unsupported......4

Errors in .github/agents/orchestrator.agent.md
[ERROR] file://.github/copilot-instructions.md (at 52:23) | File not found. Check if file exists and path is correct

Errors in .github/ISSUE_TEMPLATE/add-or-update-hal-driver.md
[ERROR] http://mcd.rou.st.com/modules.php?name=mcu (at 28:60) | Connection failed. Check network connectivity and firewall settings

Errors in README.md
[404] https://api.securityscorecards.dev/projects/github.com/embedded-pro/hal-st (at 3:199) | Rejected status code: 404 Not Found
[ERROR] https://st.com/ (at 5:93) | HTTP/2 protocol error. Server may not support HTTP/2 properly | Followed 1 redirect. Redirects: https://st.com/ --[301]--> https://www.st.com/

Hint: Followed 111 redirects. You might want to consider replacing redirecting URLs with the resolved URLs. Use verbose mode (`-v`/`-vv`) to see redirection details.
Hint: You can configure accepted/rejected response codes with `-a` or `--accept`

⚠️ MARKDOWN / markdownlint - 19 errors

.github/agents/executor.agent.md:11 error MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "You are the executor agent for..."]
.github/agents/orchestrator.agent.md:18:401 error MD013/line-length Line length [Expected: 400; Actual: 420]
.github/agents/orchestrator.agent.md:18 error MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "You are the orchestrator agent..."]
.github/agents/planner.agent.md:11 error MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "You are the planner agent for ..."]
.github/agents/planner.agent.md:39 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/agents/reviewer.agent.md:14 error MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "You are the reviewer agent for..."]
.github/agents/reviewer.agent.md:122 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/instructions/hal-st-cpp.instructions.md:18 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/ISSUE_TEMPLATE/add-or-update-hal-driver.md:10 error MD025/single-title/single-h1 Multiple top-level headings in the same document [Context: "How to import a HAL driver"]
.github/prompts/orchestrate.prompt.md:8 error MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "Start a new development workfl..."]
CHANGELOG.md:83 error MD024/no-duplicate-heading Multiple headings with the same content [Context: "⚠ BREAKING CHANGES"]
CHANGELOG.md:87 error MD024/no-duplicate-heading Multiple headings with the same content [Context: "Features"]
CHANGELOG.md:94 error MD024/no-duplicate-heading Multiple headings with the same content [Context: "Bug Fixes"]
CHANGELOG.md:103 error MD024/no-duplicate-heading Multiple headings with the same content [Context: "Features"]
CHANGELOG.md:122 error MD024/no-duplicate-heading Multiple headings with the same content [Context: "Bug Fixes"]
CHANGELOG.md:140 error MD024/no-duplicate-heading Multiple headings with the same content [Context: "⚠ BREAKING CHANGES"]
CHANGELOG.md:144 error MD024/no-duplicate-heading Multiple headings with the same content [Context: "Features"]
CHANGELOG.md:151 error MD024/no-duplicate-heading Multiple headings with the same content [Context: "Features"]
CHANGELOG.md:162 error MD024/no-duplicate-heading Multiple headings with the same content [Context: "Bug Fixes"]

Notices

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[Copilot]

Pull request overview

Updates the embedded CI matrix to use GCC ARM toolchain release 15.2.Rel1 (up from 13.2.Rel1).

Changes:

• Bumps matrix.gcc in the embedded_build job to 15.2.Rel1.