Fix #708, support and test for current Node LTS versions

[makenowjust]

Fix #708

Changes

• Set target in esbuild config explicitly. See target in tsconfig doesn't affect esbuild's runtime library evanw/esbuild#2628.
• Set engines field in package.json
• Test for each current Node LTS version on CI.

[codecov-commenter]

Codecov Report

Merging #720 (8c7c0bf) into main (219ff13) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              main      #720    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           66        56    -10     
  Lines         2861      1970   -891     
  Branches       475       322   -153     
==========================================
- Hits          2861      1970   -891     

Impacted Files	Coverage Δ
packages/recheck/src/main.ts
packages/recheck/src/lib/exe.ts
packages/recheck/src/browser.ts
...ges/eslint-plugin-redos/src/rules/no-vulnerable.ts
packages/recheck/src/lib/pure.ts
packages/recheck/src/lib/native.ts
packages/recheck/src/lib/worker-pool.ts
packages/recheck/src/lib/agent.ts
packages/recheck/src/lib/env.ts
packages/recheck/src/lib/java.ts

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more