[Synthetics-job-manager] Update helm chart for SJM (newrelic#1300)

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#### Is this a new chart
No

#### What this PR does / why we need it:
Update helm charts with latest synthetics-job-manager version:
release-341

#### Which issue this PR fixes
*(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)`
format, will close that issue when PR gets merged)*
  - fixes #

#### Special notes for your reviewer:

#### Checklist
[Place an '[x]' (no spaces) in all applicable fields. Please remove
unrelated fields.]
- [x] Chart Version bumped
- [ ] Variables are documented in the README.md
- [x] Title of the PR starts with chart name (e.g. `[mychartname]`)

charts/synthetics-job-manager/Chart.yaml

@@ -2,8 +2,8 @@ apiVersion: v2
 name: synthetics-job-manager
 description: New Relic Synthetics Containerized Job Manager
 type: application
-version: 1.0.63
-appVersion: release-339
+version: 1.0.64
+appVersion: release-341
 home: https://github.com/orgs/newrelic/teams/proactive-monitoring
 maintainers:
   - name: Philip-R-Beckwith