Set the minimum Java toolchain to Java 17.

[jaynewstrom-stripe]

Summary

I had previously set this to 21 to work around a paparazzi issue, but the actual minimum we need is 17.

Ideally we just ignore this, and everyone is on a newer java toolchain version, which is why I added the check.

Motivation

Less noise for people trying to build the SDK.

[github-actions[bot]]

Diffuse output:

OLD: identity-example-release-base.apk (signature: V1, V2)
NEW: identity-example-release-pr.apk (signature: V1, V2)

          │          compressed          │         uncompressed         
          ├───────────┬───────────┬──────┼───────────┬───────────┬──────
 APK      │ old       │ new       │ diff │ old       │ new       │ diff 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
      dex │     2 MiB │     2 MiB │  0 B │   4.1 MiB │   4.1 MiB │  0 B 
     arsc │     1 MiB │     1 MiB │  0 B │     1 MiB │     1 MiB │  0 B 
 manifest │   2.3 KiB │   2.3 KiB │  0 B │     8 KiB │     8 KiB │  0 B 
      res │ 301.8 KiB │ 301.8 KiB │  0 B │ 455.5 KiB │ 455.5 KiB │  0 B 
   native │   6.2 MiB │   6.2 MiB │  0 B │  15.8 MiB │  15.8 MiB │  0 B 
    asset │   7.1 KiB │   7.1 KiB │  0 B │   6.8 KiB │   6.8 KiB │  0 B 
    other │    90 KiB │    90 KiB │ -7 B │ 170.1 KiB │ 170.1 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │   9.6 MiB │   9.6 MiB │ -7 B │  21.5 MiB │  21.5 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 19994 │ 19994 │ 0 (+0 -0) 
   types │  6179 │  6179 │ 0 (+0 -0) 
 classes │  4973 │  4973 │ 0 (+0 -0) 
 methods │ 29965 │ 29965 │ 0 (+0 -0) 
  fields │ 17503 │ 17503 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  164 │  164 │  0   
 entries │ 3622 │ 3622 │  0

APK

``` compressed │ uncompressed │ ──────────┬───────┼───────────┬──────┤ size │ diff │ size │ diff │ path ──────────┼───────┼───────────┼──────┼──────────────────────── 28.4 KiB │ -11 B │ 62.8 KiB │ 0 B │ ∆ META-INF/CERT.SF 1.2 KiB │ +2 B │ 1.2 KiB │ 0 B │ ∆ META-INF/CERT.RSA 25.2 KiB │ +2 B │ 62.7 KiB │ 0 B │ ∆ META-INF/MANIFEST.MF ──────────┼───────┼───────────┼──────┼──────────────────────── 54.8 KiB │ -7 B │ 126.7 KiB │ 0 B │ (total) ```