v2.5.6

Changes

• 0636496a2 - SsrSite: fix sst dev error when enableLiveDev is set to false
• 1e7c32887 - SsrSite: fix permissions not attached to placeholder server function
• 2f16a73da - sst secrets: fix ssmPrefix is not respected
• 5cd2d4fde - Sanitize stage names with invalid characters

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Update using:

$ npx sst update 2.5.6
$ yarn sst update 2.5.6