[Snyk] Security upgrade python from 3.7-slim to 3.13.0a2-slim

[tsmithv11]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• src/emailservice/Dockerfile

We recommend upgrading to python:3.13.0a2-slim, as this image has only 36 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	721	Out-of-bounds Write SNYK-DEBIAN12-GLIBC-5927132	Proof of Concept
	721	Out-of-bounds Write SNYK-DEBIAN12-GLIBC-5927132	Proof of Concept
	514	Access of Uninitialized Pointer SNYK-DEBIAN12-KRB5-5825659	No Known Exploit
	614	CVE-2023-5363 SNYK-DEBIAN12-OPENSSL-6032384	No Known Exploit
	614	CVE-2023-5363 SNYK-DEBIAN12-OPENSSL-6032384	No Known Exploit

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[github-actions]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
❌ COPYPASTE	jscpd	yes		30	2.84s
❌ DOCKERFILE	hadolint	1		1	0.11s
❌ REPOSITORY	checkov	yes		382	13.41s
❌ REPOSITORY	devskim	yes		8	1.05s
✅ REPOSITORY	dustilock	yes		no	7.71s
✅ REPOSITORY	gitleaks	yes		no	1.84s
✅ REPOSITORY	git_diff	yes		no	0.05s
✅ REPOSITORY	secretlint	yes		no	1.72s
✅ REPOSITORY	syft	yes		no	0.4s
❌ REPOSITORY	trivy	yes		1	6.34s
❌ SPELL	cspell	2		3	3.72s
✅ SPELL	misspell	1	0	0	0.11s

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