fix: backend/package.json & backend/package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-NANOID-8492085
- https://snyk.io/vuln/SNYK-JS-AXIOS-6671926

backend/package.json

@@ -155,8 +155,8 @@
     "@peculiar/x509": "^1.12.1",
     "@serdnam/pino-cloudwatch-transport": "^1.0.4",
     "@sindresorhus/slugify": "1.1.0",
-    "@slack/oauth": "^3.0.1",
-    "@slack/web-api": "^7.3.4",
+    "@slack/oauth": "^3.0.2",
+    "@slack/web-api": "^7.8.0",
     "@ucast/mongo2js": "^1.3.4",
     "ajv": "^8.12.0",
     "argon2": "^0.31.2",
@@ -188,7 +188,7 @@
     "mongodb": "^6.8.1",
     "ms": "^2.1.3",
     "mysql2": "^3.9.8",
-    "nanoid": "^3.3.4",
+    "nanoid": "^3.3.8",
     "nodemailer": "^6.9.9",
     "odbc": "^2.4.9",
     "openid-client": "^5.6.5",